ShowForce is like Foursquare for event-goers (conferences, trade shows, fairs). It's part event-guide, part friend-finder, and part discovery tool. It helps attendees plan their time more effectively, meet and connect with new people, and discover booths they might otherwise miss.

Here's a 1:30min long demo video:
http://www.youtube.com/watch?v=JckoAF16c6I

And here's the free iPhone app:
http://itunes.apple.com/ca/app/showforce-with-bump/id367995182?mt=8