I'm having to spend two weeks in California on business and thought I'd spend my weekend (9/10 april) at some US club racing. I'll be around'ish the San Francisco area...I've browsed a few google sites thrown at me at random but cannot find anything suitable so far.
Any pointers? Cheers.

Too bad! Our AFM races at Infineon are the following weekend. I suggest you stay for them or come back. Many of our fastest guys are on BMWs this year, Should make for some very wicked racing.
Unfortunately, there will be no SD racing as I nearly killed myself 5 weeks ago at that track on my SD.
I will be at the races though, with my team- Uniform Speed
http://www.uniformspeed.com