Biographical Dictionary
http://www.s9.com/
S9.com is a Wikipedia type system and everyone can edit biographies or even make your own

Biography.com
http://www.biography.com/search/
Search over 25,000 of the greatest lives, past and present, like Bruce Lee, George W.Bush...

Infoplease
http://www.infoplease.com/ipa/A0760585.html
It shows the biographies of the U.S. presidents