I originated on the WP forum, but quickly got bored of it when I discovered IRC. I discovered other forums in the process, location specific to the UK, where I live, namely Aspie Village and Aspie Vision. Also in branching out, I found Gestalt, created my own, Unravel, and then finally found here, pretty much the only forum I've settled into really.
I'm still more IRC-focused, though, and that's why I'm not really a frequent poster. In general, forums lack the spark that chat has, but still.... fun way to pass the quiet minutes.