The BayProg Yahoo Group Mailing List is the other half of the BayProg site. It welcomes band news, gig announcements, musicians wanted, advice, etc.
The Bay Area DIY Electronics Group is somewhat directed toward electronic music instruments.
Craig's List Includes a bulletin board for musicians as well as an instruments for sale section.
SFMusician.com has ads for musicians, instruments, gear, practice space, gigs, services, wanted and available.
SJ Metro Music Classifieds Music classified ads from the San Jose Metro.
The ba.music Newsgroup for Bay Area music postings.
The rec.music.progressive Newsgroup for progressive rock postings.