If you're currently waiting for your bags, because you flew sometime since the 4th of January 2015, and you came in via SFO: go to the airport they're there!
Customer service will tell you they're "with the delivery company" (they've been telling me this for three days). They'll tell you that "once it's with the delivery company, it goes to their warehouse" - there is no warehouse, at SFO it's ONE GUY as far as I can tell. They won't give you his name (it's Eddie - dial 650 652 5600 for an amusing full mailbox and "professional response" (it's been this way for over a year AFAICT - search around for the company name)). The company is called "Sterling Baggage" (not "whereismysuitcase.com", which is run by Bags Inc. who are similarly knowledge-less at all public phone numbers). If you call the SFO office, the lady there will tell you "it's on it's way" (which is also a lie).
I took the risk, given I'd been told by everyone that it was "on it's way, today" for the last three days, of driving up there. I'm