Anonidox
Anonidox is a web based tool, designed as a sort of search engine for dox, themed after google.
More info will appear if the site ever comes back (which is becoming increasingly improbable).
while use this:
http://anonym.to/?http://pipl.com/
http://anonym.to/?http://www.spokeo.com/
other service can be found there:
Dox