My career:
- Atheist Network
In terms of straight atheist rhetoric, this place was quite good to me. I made a reasonable name for myself as an atheist ‘big dog’ with respect to demolishing theistic arguments. At some point, the community turned sour and many folks whom I enjoyed reading stopped posting. Presently, the board’s Freethinker’s section is the only one I look at, and it leaves a lot to be desired. I seldom post.
- Graveyard of the Gods
In many ways an offshoot of the above; many of the aforementioned posters wound up here, including one Francois Tremblay who now owns Graveyard and is the main contributor to the board. Bascially, if you post here, it’s you against him. He’s worth the effort - maybe the smartest guy I’ve met online - but can be quite tunnel-visoned with respect to his atheistic objectivism. Board has seen its best days and, like Atheist Network, has lost a majority of the posters I enjoyed reading. Moreover, a certain thread on this board I was very active in led to my rejection of atheism; this occurence led to the overall rejection of the board’s main vernacular and made posting very difficult. In a recent attempt to return to this board, I had a run-in with Franc in which, I thought, he lacked the overall sense of open-mindedness to be taken seriously as a philosopher. Haven’t returned.
- Able2Know - Philosophy Forum
Able2Know, for those who don’t know, is a ‘megaboard’ with probably several thousand active posters and some 30 or more forums. Its philosophy forum is composed of a handful of very good posters (I want to say I’ve seen SIATD there, e.g., though he doesn’t mention it above) but overall, the forum lacks excitement. This had been my main board until finding ILP and is still listed in my Favorites folder.
- Mad Philosophers
Mentioned a couple times already, I concur with what’s been said: boring overall, and dominated by a few regs who bring nothing much too exciting. Indeed, contrary to what what willem said, the forum does not honour its name, imo. Also, much too slow. Haven’t been there in months.
- Frostcloud
I still say this board has lots of potential. The pace is excellent - relatively slow but with steady movement - and it’s organized exceptionally. Thread titles are great; but its downfall is that seldom is there a thread that lives up to its title: i.e. subjects are excellent, posts are not. I would often be forced to point this out, and I got the sense most people there thought I was an asshole. Eventually gave up.
- Internet Infidels
First, I should mention the first time I attempted to register here, the mods rejected my application because I put ‘Solitude’ as my location, saying something like, ‘We only want serious posters here.’ A few months later I overlooked this and re-registered. Presently, I’d say this board is worthwhile, but haven’t been there since finding ILP.
- ILP
For the moment, I’d say this is the best philosophy board on the net. We’ll see how long this opinion lasts. 
[Edits are either very subtle or grammatical.]