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Re:Blogger’s fresh new look by irahul on Wednesday August 31, 2011 @03:18PM (#2947112)
What makes you think it's GWT? The blogpost doesn't mention it.
Re:Blogger’s fresh new look by lapusta on Thursday September 01, 2011 @02:55AM (#2948923)
Switch to the new UI, open source code and search for __gwt_historyFrame, com_google_blogger_b2_gwt_dashboard_DashboardGwt etc.

Actually markup/generated script is pretty common for ones who worked with GWT, so it's very easy to distinguish such sites.