A travel deals site for people wanting to tour silicon valley historical sites? hook it up with tours of companies hq's combined with lecture series and exclusive resort packages.
I like this idea. Maybe even things like Jonothan Coulton's cruises and conventions. A full fledged travel agent for the like minded. Or hire one and you just do the site and take a cut. Also have a kids section where you list youth tech summer camps or space camps, etc. The premier geek getaway site.