[Andys]

I have a great little app for my Android G1 that shows your location on a google map (GPS) as well as the location of the cell tower you're connected to. I suspect Apple don't provide an API for this sort of stuff..

[waterlesscloud]

What is that app named? I want it!

[biafra]

CellFinder is one app that does this.

[tjakab]

There's also Antennas.

[thwarted]

One is called "Signal Radar". I found it by searching for "cell tower" in the market, first hit.

[elblanco]

I use cellmapper.