Just discovered this blog post about Discovery Channel's online game: Sharkrunners.
You're given a virtual boat and a virtual crew to track real life sharks that have been tagged with GPS receivers.
http://radar.oreilly.com/archives/20...unners_re.html
I've just left port with my newly acquired ship, the Black Pearl, but still haven't encountered any sharks..
Not the most action filled online game, but it's certainly an interesting concept using real life data in online games and I'm sure we'll see more like these soon..
Direct link to Sharkrunner at Discovery Channel:
http://www.sharkrunners.com/