Today saw the official release of Michelin's San Francisco Bay Area & Wine Country Restaurants Guide 2010, the fourth edition of the local star search. Michelin director Jean-Luc Naret told SFoodie 10 inspectors did the field work for this year's Nor Cal guide. For those who care, Michelin ratings always raise eyebrows, if only slightly.This year's forehead wrinkler, already pinging around the blogosphere after the press release hit inboxes yesterday, was that inspectors stripped restaurant Michael Mina of half its two stars and awarded Oakland newcomer Commis one. (That means S.F. proper is a city of only a single two-star establishment, Daniel Patterson's Coi. Maybe David Chang was right... ) For those of you doing the numbers, the one-star category ballooned from 25 to 34. Inspectors drove their rental Accords east through the Caldecott Tunnel to check out Walnut Creek and Lafayette (Chevalier, a truly mediocre old-school French place in Lafayette, landed on the Bib Gourmand budget favorites list). And there are new symbols in the guide for small plates, and notable sake and cocktails.