I've heard a lot of talk about ZabaSearch. It searches publicly able government records as well as some commercial sources. A lot of people say that it violates their privacy because it's so easy to find people, so I guess it works pretty good.
Judging from the chatter on WebmasterWorld, I think G's having problems related to their latest update - lots of sites are disappearing (us included) at a frightening rate. Fortunately, Y! still likes us. :)