Biography.com usually has in-depth biographies of over 25,000 individuals. SUGGESTION: Just put the person's last name in the box below.
Information Please Biography Alamanac
Almanacs are handy. They'll often tell you quick facts about people, particularly figures from popular culture (actors, athletes) that might not be in the encyclopedia (yet).
28,000 people. Most of these biographies are short, almanac style entries.
If you're looking for someone you didn't find, or you're looking for even more information, try the encyclopedias page. They will often contain articles about people that are... encyclopedic.