FirstGov is the U.S. Government's official web portal. It provides online information, services and resources through both government and other Internet sites. Because of its huge size, searching it had been an issue. Recently, the government granted Vivisimo, the owner of the Clusty search engine, a contract to provide the search engine for FirstGov. You can search from either FirstGov's main page or from its search page. There have been many improvements to the search functionality of this site including clustering of results and a much bigger database. To read much more about this new search engine and the wonderful improvements see Gary Price's article in Search Engine Watch.
Ernster, the Virtual Library Cat