yep, every1's said the same thing, but just wanted to reiterate
if you are flying ANYWHERE in california (or anywhere else southwest flies), your best bet will 99% of the time ALWAYS be with southwest. unless for some reason you HAVE to fly into SFO. can't imagine why... oakland is much more connected via public transportation
of course their specials arent quite as great as before right now. i think its something like 40-some bucks one way, i used to do $34 one way back and forth all the time. cheaper than driving actually.