Trepia partners with Telerama to offer Wi-Fi-based proximity social tools: Trepia's software can connect people who have registered and are using the software with one another when in proximity.
The real question I have, of course, is how many people want to just meet random folks who happen to be in the same area, even if you know their interests, etc.? I'm somewhat gregarious, but one of my biggest problems is staying in touch with many friends, often nowhere near my proximity, not making new ones.
I suppose this is an outgrowth of the mobile society in which people are on the move and on the make in new places all the time. Is this all about dating? (asks the married man). See, I'm so unhip, it's no wonder if my bum were to fall off.