Halcyon List of thinkers
Estimated IQs of some of the greatest geniuses
InforSeek list of Internet Celebrities
Technoprophets
Celebrities in Cognitive Science
Dave Krieger's list of Exceptional people
Warped People page
Glass Bead Game - Biographies of great people
Eric's Treasure Trove of Scientific Biography
Scientists: biographies
UTNE Reader list of Visionaries They can't tell the difference between thinkers, dreamers, executives, and social activists, and the choice is somewhat mainstream (not extreme like mine ;-) ) but some people there are interesting.
Great Mathematicians
Prominent Anarchists and Left-Libertarians
Great Writers and Poets
Prominent sociologists
Great Canadian Scientists
Celebrity Atheist List and Famous Dead Non-theists - people who have advocated living life without deference to a higher power.
Major Western Philosophers