iOS only: Bump already shares photos, contacts, calendar items and even music. Now you can "Bump" iPhones with other users to send them a list of apps you recommend. It's a geeky ice-breaker, perhaps, or low-key tech support tool.
It's not just a list of all your apps installed, luckily. You pick and choose the apps you want to send over a fist-to-fist connection, then do the nerdy bump thing. If you're headed to a conference, or another tech-heavy event, it might make sense to get your standard app recommendations ready. Bump is a free download for iOS devices.