Richard Dawkins' homepage at Oxford University

Interesting thinker, interviewed on NOW with Bill Moyers yesterday (Eliot Spitzer was also interviewed: a keeper).
Dawkins is a superb science writer, and came up with the notion of "memes", thoughts that behave and propogate along the principles of genetics and evolution.
Has a new book on evolution, and his previous book, the Devil's Chaplain, was well received.