http://www.gearthblog.com/blog/archives/2009/04/easter_weekend_imagery_update_for_g.html

"Google has pushed out a new imagery update in Google Earth just in time for Easter! No details have been released, but after a few E-mails from GEB readers (thanks Andreas, Jan, and Doug!) I've confirmed several updates. Thankfully, Google did NOT update both GE and Google Maps at the same time like they did last time. This means we can compare GE to Google Maps to confirm whether the imagery is new. "