AsianWeek has its annual "Best of Asian Pacific American Whatever" issue on the stands now. Voting is by its readers. AsianWeek seems to have a yuppie (YAPI?) target audience who may or may not see chow as a high priority.
Best "northern" Chinese restaurant was Da Shanghai on Judah Street. I'm OK with that, I guess, if they really mean "Best Cheap Shanghainese Food".
Best "southern" Chinese restaurant was Chef Jia's, which aspires to be Hunanese. (Remember when everything not Cantonese was called "northern" Chinese food?)
Hmm, Cantonese cuisine seems to have been stiffed altogether. I may be a partisan of Shanghainese food (I get fed it twice a day) but I'll grudgingly acknowledge that within China, Cantonese is almost universally considered the highest cuisine in China.
Oh, yes, there was a "Best Dim Sum" category (Kan's, has anyone actually been there?). Maybe that's the Cantonese category.
The full list, including best API DJ and best Karaoke bar, is in the current issue of AW on the newstands (hey, Lalita Thai is a good cheap business lunch, but is it the best Thai food in SF?). It'll probably be on the AsianWeek website (the new edition isn't up yet, as of this posting).