The Stockton and Ellis entrance/exit from BART and Muni, with the escalator that dumped you off right by the door of the Apple Store, is closing today due to the construction of the Central Subway which is generally mucking up that entire block. The bad news is the temporary closure of this handy entrance will last six years, essentially until the whole subway project is complete.
If Willie Brown were an avid Twitterer, he'd surely bemoan this latest inconvenience as just another reason the "Central Circus" should go to hell, but alas, he is not.
Meanwhile, at the other end of the rather brief subway line, the SFMTA is rejecting all their current bids for the Chinatown Station, as the Ex reports. Engineers apparently identified a cost-saving measure that hadn't been previously considered, so the project is going out for bid again.