San Francisco Resources
The best website for SF nightlife is SFStation.
Flavorpill has a nice weekly calendar with recommendations.
For more out-of-the-way events, try the underground list, Squidlist. You can sign up at their site but you will quickly get flooded with email. I prefer to consult this nifty calendar that some guy built.
The Squidlist is the only way to discover things like the power tool drag races.