Last summer when I was up in Napa Valley for the first time and tasting the wines at Chateau Montelena, the staff there told me about a new venture they were pursuing. Along with seven other wineries, they were going to open a cooperative-style wine bar at the Four Seasons San Francisco.
The wine bar is finally open, and going by the name, The Press Club. I did a little sleuthing and wrote it up for HotelChatter (since it IS in a hotel, after all). Take a look at the article here: http://www.hotelchatter.com/story/2009/5/1/135141/3544/hotels/A_New_Underground_Wine_Bar_Opens_in_the_Four_Seasons_San_Fran