What's surprising is that Google is not using GWT for its critical online service, which almost all of them are AJAX-based or have AJAX veneer: GMail, GMaps, GReader, GDocs, GSpreadsheet, GAJAX-Search, GFinance, GHomePage, ... none of them use GWT! The question is, why did Google develop GWT if it cannot use it? And by the way who is using GWT ?