This place is FULL of unique books. I always enjoy browsing and often walk away with something very interesting. I've bought several vintage books here that are out of print and hard to find. The owners also have a great selection of mini-books by local artists/writers. There's a play area in the back of the store for kids, and prices are very reasonable, especially compared with some other bookstores. The owners know a ton about books - I once just described a book I was looking for in the barest terms, and he knew what it was, and that they had it! It's on Telegraph at Alcatraz.
Pros: great selection and fun kids section