I took a look at FireChat, but bluetooth is a bit too 'nearby' for me. Very cool that it's off the grid, but only useful if you're basically right next to them anyways.

I wanted something like: talk to everyone nearby in a football/hockey/tri-d chess stadium, but bluetooth falls a bit short. What would be really cool is if you could set up a relay system through other devices.

I've made (i.e. works, but not polished yet) something similar: http://www.shoutium.com which has ranges of 1-100KM around your current location. It does require internet, so it probably isn't aimed at the firechat crowd anyways. Very few users unfortunately, guess I'll work on advertising after the iOS version is done -_-