FXCM makes available a feed for select instruments which are not updated in real time, though are refreshed on an interval. This feed is available in three 'flavors'. The xml returned is a valid XML documents with a Rates tag as the root with a Rate tag as child elements.

http://http://rates.fxcm.com/RatesXML
Code:
<Rate Symbol="EURUSD">
    <Bid>1.38694</Bid>
    <Ask>1.3872</Ask>
    <High>1.41729</High>
    <Low>1.38683</Low>
    <Direction>1</Direction>
    <Last>15:22:43</Last>
</Rate>
http://http://rates.fxcm.com/RatesXML2
Code:
<Rate Symbol="EURUSD">
    <Symbol>EURUSD</Symbol>
    <Bid>1.3849</Bid>
    <Ask>1.38509</Ask>
    <High>1.41729</High>
    <Low>1.38485</Low>
    <Direction>0</Direction>
    <Last>15:30:13</Last>
</Rate>
http://http://rates.fxcm.com/RatesXML3
Code:
<Rate Symbol="EURUSD">
    <Symbol>EURUSD</Symbol>
    <Bid>1.38446</Bid>
    <Ask>1.38472</Ask>
    <High>1.41729</High>
    <Low>1.38426</Low>
    <Direction>-1</Direction>
    <Last>15:30:43</Last>
    <Date>2011-10-31</Date>
</Rate>
With any of the three formats above, it is possible to create a web page that will access the feed at a regular interval and display the rate information using AJAX methodology. An example of code used, not compatible with Internet Explorer, to do this.

rates.js
PHP Code:
// declare global variables used in the gadget
var loading, url, rssXML;
// a 'constant' structure for the outputting of each instrument's data
// each class is defined in FXCMRates.css
// the background of the current rates section will change color depending on the direction
var strWrapper =
  "<div class='instrument'>" +              // create an instrument section
    "<div class='identity'>" +              // create an identity section
      "<div class='last'>[last]</div>" +    // create a section for the time of last update
      "<div class='symbol'>[symbol]</div>" +// create a section to display the symbol
      "<div class='date'>[date]</div>" +    // create a section for the date of last update
    "</div>" +                              // close the identity section
    "<div class='rates'>" +                 // create a rates section
      "<div class='high'>[high]</div>" +    // create a section to display the high of the instrument
      "<div class='current [direction]'>" + // create a current rate section
        "<div class='bid'>[bid]</div>" +    // create a section to display the bid rate
        "<div class='ask'>[ask]</div>" +    // create a section to display the ask rate
      "</div>" +                            // close the current rate section
      "<div class='low'>[low]</div>" +      // create a section to display the low of the instrument
    "</div>" +                              // close the rates section
    "<div class='clear'></div>" +           // create a section to ensure page alignment
  "</div>";                                 // close the instrument section

/**
 * init()
 * triggered at the Load event for the 'page'
 */
function init()
{
  // define the a reference to a section of the page
  loading = document.getElementById("loading");
  // define the url to feed to process
  url = "http://rates.fxcm.com/RatesXML3";
  // prime the page by calling getRSS()
  getRSS();
  // set a regular interval to call getRSS() evern 60 seconds
  setInterval("getRSS()", 60 * 1000);
}

/**
 * getRSS()
 * Creates an ActiveX instance of the XMLHttpRequest object to request a remote web document to be
 * accessed through a DOM.
 */
function getRSS()
{
  // display a note within the loading section of the page that a connection is being attempted
  loading.innerText = "Connecting...";           
  // define a new XMLHttpRequest object
  rssObj = new XMLHttpRequest();
  // define a connection to the specified url, denoting it is an asynchronous call
  rssObj.open("GET", url, true);
  // when state of the connection changes, perform these actions
  rssObj.onreadystatechange = function()
  {
    // if the state is Completed (4)
    if (rssObj.readyState == 4)
    {
      // if the status of the request is Ok (200)
      if (rssObj.status == 200)
      {
        // create a new timestamp
        now = new Date();
        // define reference to the minutes
        min = now.getMinutes();
        // define reference to the seconds
        sec = now.getSeconds();
        // display a formated timestamp of the refresh
        loading.innerHTML = "Last updated:<br />" +
          (now.getMonth() + 1) + "/" + (now.getDate()) + "/" + (now.getFullYear()) + " " +
          now.getHours() + ":" + ((min < 10) ? "0" + min : min) + ":" + ((sec < 10) ? "0" + sec : sec);
        // save the response DOM as the global rssXML
        rssXML = rssObj.respon---ML;
        // call the function to display the new rates
        parseRSS();
        // if there was an error, clear the interval timer
        if (chkConn) clearInterval(chkConn);
      }
      // othwise there may be a problem
      else
      {
        // define a reference to a connection check
        var chkConn;
        // denote that the attempt failed
        loading.innerText = "Unable to connect";
        // set an interval to try again in 30 seconds
        chkConn = setInterval("getRSS()", 30 * 1000);
      }
    }
    // otherwise 
    else
      // denote that the data is a being loaded
      loading.innerText = "Loading...";
  }
  // send the request and initiate the connection
  rssObj.send();
}

/**
 * parseRSS()
 * having recieved the external page as a DOM, traverse it to format the data to this page
 */
function parseRSS()
{
  // check the preferences to see whether there should be a filter on the instruments
  instrFilter = ""; // declare and prime the instrument filter
  // read into the instrument filter the value of the associated preference
  instrFilter = System.Gadget.Settings.readString("instrFilter");
  // if the instrument filter is undefined in preferences, set the filter to all
  if (instrFilter == "") instrFilter = "*";
  // create a reference to the html wrapper for the instrument display
  targetDiv = document.getElementById("instruments");
  // create a collection of all the Rate elements in the feed
  rates = rssXML.getElementsByTagName("Rate");
  // clear the html wrapper of content
  targetDiv.innerHTML = "";
  // iterate through the Rate elements
  for(i = 0; i < rates.length; i++)
  {
    // define which symbol currently being processed
    symbol = rssXML.getElementsByTagName("Symbol")[i].childNodes[0].nodeValue;
    // check to see if the symbol passes the current filter
    if(instrFilter.indexOf("*") >= 0 || instrFilter.toUpperCase().indexOf(symbol) >= 0)
      /**
       * use javascript String.replace function and chaining to populate values into the html
       * structure defined in strWrapper, appending the result to the html wrapper
       *
       * this occurs by referencing the appropriate tag of the same index
       */
      targetDiv.innerHTML += strWrapper
        .replace("[direction]", "d" + rssXML.getElementsByTagName("Direction")[i].childNodes[0].nodeValue)
        .replace("[last]", rssXML.getElementsByTagName("Last")[i].childNodes[0].nodeValue)
        .replace("[symbol]", symbol)
        .replace("[date]", rssXML.getElementsByTagName("Date")[i].childNodes[0].nodeValue)
        .replace("[high]", fxRate(rssXML.getElementsByTagName("High")[i].childNodes[0].nodeValue, symbol))
        .replace("[bid]", fxRate(rssXML.getElementsByTagName("Bid")[i].childNodes[0].nodeValue, symbol))
        .replace("[ask]", fxRate(rssXML.getElementsByTagName("Ask")[i].childNodes[0].nodeValue, symbol))
        .replace("[low]", fxRate(rssXML.getElementsByTagName("Low")[i].childNodes[0].nodeValue, symbol))
      ;
  }
  // add an adjustment section to keep page alignment, class defined in FXCMRates.css
  targetDiv.innerHTML += "<div class='clear'></div>";
}

/**
 * fxRate(double, string)
 * format a given rate with trailing zeros depending on the instrument symbol
 */
function fxRate(rate, symbol)
{
  // ensure that the double value is a numerical value
  r = parseFloat(rate);
  // declare and prime the return value as a string
  str = "";
  // if the instrument uses the Japanese Yen, set to 3 decimal places
  if(symbol.indexOf("JPY") > 0) str += r.toFixed(3);
  // if the instrument uses Silver or Gold, set to 2 decimal places
  else if((symbol.indexOf("XAU") >= 0) || (symbol.indexOf("XAG") >= 0)) str += r.toFixed(2);
  // if the instrument is the USDOLLAR, set to 0 decimal places
  else if((symbol.indexOf("DOLLAR") >= 0)) str += r.toFixed(0);
  // otherwise, set to 5 decimal places
  else str += r.toFixed(5);
  // return an html formated string, classes defined in FXCMRates.css
  return "<span class='reduce'>" + str.slice(0, -2) + "</span>" + str.slice(-2, str.length);
} 
rates.htm
HTML Code:
<!DOCTYPE html>
<html>
  <head>
    <script type="text/jscript" language="jscript" src="rates.js"></script>
    <style>
#gadgetContent
{
  margin: 8px;
  padding: 0;
  position: relative;
  text-align: center;
  overflow: hidden;
}
/* #loading { color: #fff;  } */
#loading, #instruments { width: 242px; height: 36px; }
#instruments, .instrument, .identity, .rates, .current { position: relative; }
.identity, .rates  { width: 50%;}
.last, .high, .low, .date, .current, .symbol { height: 16px; font-size: 13px; width: 100%; }
.bid, .ask { font-size: 12px; text-align: right; width: 49%; margin-right: 1%; }
.bid .reduce, .ask .reduce { font-size: 9px; }
.symbol, .current { height: 32px; font-size: 20px; }
.identity, .rates, .bid, .ask { float:left; }
.current, .symbol { line-height: 32px; }
.d1  { background-color: #00A; color: #fff; }
.d0  { background-color: #888; color: #fff; }
.d-1 { background-color: #A00; color: #fff; }
.instruments, .instrument, .identity, .rates, .current, .last, .high, .low, .date, .symbol
{ display: block; margin: 0; padding: 0; text-align: center; }
.instrument
{
  float: left;
  width: 220px;
  height: 64px;
  border-style: inset;
  border-width: 2px;
  margin: 0;
}
.last, .high, .low, .date, .current, .symbol, .bid, .ask, #loading
{
  color: #fff;
  text-shadow: 1px 1px 1px #000;
}
#instruments
{
  height: 323px;
  overflow-y: auto;
  margin: 0;
}
.clear { clear: both; }
    </style>
  </head>
  <body onload="init();">
    <div id="gadgetContent">
      <div id="loading">loading...</div>
      <div id="instruments"></div>
    </div>
  </body>
</html>
Please note that the core of the script is the use of the XMLHttpRequest object which connects and creates an XML DOM for the given URL, in this case http://http://rates.fxcm.com/RatesXML3. As such, for many browsers, it will not run on your local computer due to security.

Alternatively, with a few adjustments, you can create your own Adobe Air or Windows 7 Gadget based on the code above.