TFC is huge in Toronto with the entire season sold out a few times and now that we've advanced to the Concacaf Champions League interest in MLS is very big in Toronto but I get the feeling that it's not big anywhere else.
btw - the atmosphere at TFC games is excellent and very family friendly.
I check up on MLS from time to time. The LA Galaxy have a good following and they have a couple of fantastic supporter groups (Riot Squad, Galaxians). Been a while since I've been to a Galaxy game though and that was last year when Barcelona came into town.
BTW, Spurs get a goal back on a corner from Sebastien Bassong, who has a horrid time. It's 3-1, Young Boys four minutes from half (excluding stoppage time).