Those pics are great, though alas several of the more interesting ones are broken links.

Castro St. and the surrounding area almost seems more built-up than it is today. The landscaping (apparently done this decade) really makes a difference.

The real surprise for me was California St. That's one of the most densely populated areas today, but back then it was just trees and small houses on big lots.

The Hunt Foods factory is very close to where FriendFeed is now, I think.