Have you checked out the Government 2.0 group at LinkedIn? My discussion there a few months back generated info on 2.0 initiatives by the Washington DC CIO, NASA, Utah, Mashable/Mark Drapeau, Netherlands, Washington State DOT, EPA, CDS (in Second Life), Pam Broviak and City of LaSalle, USGS, the U.S. State Department, and others. It’s a group worth joining if you’re interested in the subject.