Since I just moved to New York, I'm also looking forward to meeting some of the local geeks and entrepreneurs. Here's a description of the event, taken from the wiki:
BarCamp is an ad-hoc un-conference born from the desire for people to share and learn in an open environment. It is an intense event with discussions, demos and interaction from attendees.
Anyone with something to contribute or with the desire to learn are welcome and invited to join.
When you come, be prepared to share with barcampers. When you leave, be prepared to share it with the world.