Freewheel Hayes has a good inventory of hubs, cranks, rims, tires, bags, etc. but it's all in a very small space, mostly a pile in the display case, so not really a good place to stand around and gawk. Best shop around though.

Agreed on the eating thing, lots of great spots around the city...

My favorite Mexican, Corneta between 23rd and 24th on mission, had lunch there today.
Must eat, cheap:
King of Thai noodle on Ofarrell and Powell
Pakwan on 16th and Valencia or in the loin
Goat Hill Pizza on Conneticut and 18th