IBM runs a summer intern program for MBA students and this year David McCoy had an assignment to look into open source viral marketing.
As part of his project, he looked into which are the key networks used by developers, and this is what he found:
(click image for full size version)
About 2 years ago, I was working in a lab populated almost entirely by developers and ran a straw poll among 50 or so of the team to see which sites they frequent most regularly (for work purposes – I didn’t care about their more nefarious browsing habits).
So if you do market to this community and ‘want to fish where the fish are’, pay close attention to these sites.