I'm working on http://callmemae.be - originally built it at an 8-hour Hackathon in SF and now working on turning it into something a bit more robust so it can be properly used for introductions and a demonstration of my technical abilities.
Essentially, It lets you share a virtual business card via email or SMS (see: http://callmemae.be/nb). Essentially it was created because I can never remember my cards when I go to events, but always have my phone.
Some of the features I'm in the process of writing are:
* Bump two phones together to exchange contact info (all JS/HTML5) * Share contact info with an entire group at once * Customize your card background and choose your own fields * Analytics surrounding sharing (who's opened your card, clicked the mailto:, etc...)