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One of the things I like best about Darwin's idea is the fact that it's conceptual.  I mean that you don't have to have a strong background in biology or chemistry to understand what he's talking about  You couldn't read and really comprehend someone like Newton or Einstein without a strong background in physics and math.  Dennett underlines this perfectly.  He's a philosopher, not a biologist, but he can still change the way we think about evolution and natural selection. 

Also, Dennett has a series of awesome TED talks, <http://www.ted.com/speakers/dan_dennett.html> that I definitely recommend watching.