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For the last couple of hours I've been playing with this tiny BlackBerry application called Navizon. Tracks your location by triangulating your position via the nearest cell phone towers, very very cool.

Seems to be pretty accurate too, particularly whenever you have high cell tower density. You can have it update your location every few minutes. It can also publish your latitude and longitude as an XML feed. I have added some code to my "Where's Albert" widget so it reads and parses the XML feed, and positions me in real-time, wherever I may be. I will leave it on for now, let's see how I feel about it over time, NYC cabbies thought it was an invasion of privacy . This is the closest thing to having a GPS all the time broadcasting your position.

I had played with another similar tool called Plazes about a year ago, but it wasn't quite as good because you had to txt your position all the time, or use a client on a PC to tell it where you were. Not so with Navizon, it uses the GSM network to communicate with their servers.