The Hub bicycle co-op in Bellingham, WA:
http://myweb.wwu.edu/~browna30/index.html
I just moved here so I don't know a whole lot about them. I stopped in there last week and it seemed like a great place. Tons of old frames hanging all over the place, bins of parts everywhere, and seemingly very helpful and knowledgeable staff. It looks like a good place to be.