Vivisimo's clustered search tool "clusty" has added
a tab for searching government and related sources. (excerpt:) " Clusty's Gov tab brings together a number of special collections using Vivísimo Velocity. The Gov+ search is a powerful metasearch analogous to the Web+ tab, but focused on U.S. government and politics. It combines a metasearch of
FirstGov,
MSN limited to the ".gov" domain,
DefenseLink, political news from
Reuters,
the Associated Press, and
CNN, and a number of prominent American think tanks, including
RAND,
The Brookings Institution,
The Cato Institute,
The Heritage Foundation, and
Milken Institute. "