So it seems someone has finally gotten around to setting up a Dodgeball-like service for the UK. It be called BuddyPing.

Basically it allows you to register your location and, depending on your settings, notify and be notified when you're within a certain distance of your friends. Quite cool if you happen to be in the next pub down. Figured I'd have a play with it, so I've registered. Let me know if you sign up and I'll stick yer on me list.

Edit: Although, damn, is their email being slow. I'll be registered eventually...
buddyPing cost
Hello there, owner of buddyping here. I have made a few changes on the main page and also the FAQ about the cost. Should have made it clearer. It is currently free to use the system, with the exception of sending a text which is the cost of a normal text.