If you're commuting into the city (esp. over the Bay Bridge), you should know about casual carpooling. This site tells you all about the places where you can pick up riders or hitch a ride into town.
While all of San Francisco is wildly expensive compared to the rest of the country, there are neighborhoods of (relative) affordability within the city. - article by Joanne Huspek
If you're interesting in knowing about different events going on in the City (particularly ones the Chronicle's Pink Pages may have overlooked), be sure to bookmark this calendar.