Which companies or startups in SF give tours of their offices?
SwellJoe: If you're driving, I'd recommend a brief detour to the Computer History Museum in Mountain View.  It's just off 101, next to Microsoft and Google.  On the weekend you can see a Babbage engine run, and on the first and third Saturday of the month a PDP-1 fully restored and running Space War (and the docents doing the demos are the guys who wrote Space War, among other awesome stuff).Schedule:http://www.computerhistory.org/hours/I go every month or two, whenever a friend is in town who hasn't visited.  It's always fun.It's no startup, but it is an enlightening experience for an entrepreneurial nerd.  Those that do not learn from history are doomed to repeat it, you know?