Did a quick search, and came up completely empty on this.
I was reading cnn about Fire Eagle for yahoo and it sounds kind of cool for those active people that actually go lots of places. For somebody like me where it's work and home, it would be pretty dull.
What it does it allows you to update your location via cell phone, or other means and different applications can keep track of where you are on the web. It seems like it has a lot of pretty cool possibilities. It would be great for geocaching, and I could get messages on my phone when I am passing close to a cache, and jump out and look for it!
http://techland.blogs.fortune.cnn.co...-takes-flight/