The "what do you do when PC is down" thread got me thinking about this.
At the moment they're running this big team tournament called Smogon Premier League, in which various teams play different formats including all past generations.
omg that place has 90 million posts. O_O
Also it's really fascinating. I just checked out the Seattle subforum. Good stuff.
The only other noteworthy forum I peek around besides PC these days is Serebii, but I'm not as much a "celebrity" over there compared to PC.