Google, baby! Who else
Speaking of which, I thought I'd mention other forums I frequent, figuring many of us share similar interests. It's a Quebec-centric list, as I'm from there...
Skyscrapercity: just a crappy version of SSP where I go to overdose on city discussions.
Citydata: where I go to admire the U.S. left's fascinating struggle against stubborn American conservatism.
Mtlurb: Well, I'm from ''MTL''. Anyone with information on how this forum emerged from a nasty break-up with SSP, please share! Scandalicious.
Politiquebec: If you understand french I highly recommend this forum. An outstanding source of intelligent debates.