Wondering about using GWT on a big project? Curious whether Google's eating it's own dog food? Well look no further than Google Health.  

A quick 'view source' of the just launched Google Health site will show some code that should be very familiar to GWT developers.

<script language="javascript"
src="../gwt/dashboard/com.google.healthcare.weaver.frontend2.client.WeaverDashboard.nocache.js"></script>
<iframe id="__gwt_historyFrame" src="javascript:''" style="width:0;height:0;border:0;overflow:auto"></iframe>

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-Jeff