Doesn't seem to be one in Peninsula/South Bay. Several coffee shops (particularly Coupa in Palo Alto, Red Rock / Dana Street in Mtn View) come close, but as others have pointed out coffee shops are less focused, aren't 24/7 and (to me this is most important) don't offer much of a chance to talk to people you don't already know.
Is there an interest in an ad-hoc hack time for anyone in that area at one of the local places?
Looks promising, but a) it seems more of a hardware/mechanics/electronics organization, am I correct b) the membership fee seems somewhat high (or rather would be somewhat high if I only made use of this space for software/development, but it's very good deal for the machinery/mechanical/electronic hacking!). I'll check it out eventually - I've an interest in mechanics as well (car and motorcycle tuning) but it isn't as extensive as my interest in software hacking (as my alias suggests ;-)).
Is there an interest in an ad-hoc hack time for anyone in that area at one of the local places?