For some reason I get extra excited when I see blue birds. The ones in may area of San Francisco Bay area, that I have seen, are Western Scrub-Jay and Western Bluebird.
I saw a number of Western Scrub Jays. They are very territorial birds and I see them in the same location. I love the way the look, like an elegant plane and color coordinated at that.
I've also seen a number of Red-winged Blackbirds, they have such a distinct song. Although I haven't been able to recognize a female yet.