Navizon
I've been using Navizon for a while - it's a pretty good program where it display your location on a map and help you find stuff around you. However it's pretty new, so they are lacking data.
And that's where I come into this - using my phone (MDA Vario III), I install the Navizon software on my phone and loaded it up. It hooked up my WiFi and GPS. And it collect all mobile phone's cells and WiFi point (secure or unsecure) and when I'm done with it, I upload the data to Navizon server.
They will generate a map of where the mobile mast are and any nearest available WiFi point. This will be useful for other people who doesn't have GPS but using GPRS to search for the nearest stuff (i.e. pub)
Copied & pasted from their website - "Navizon is a software-only wireless positioning system that triangulates signals broadcasted from Wi-Fi access points and Cellular towers to help the users find their way in most major metropolitan areas worldwide."
And this is why I'm posting in here... got a mobile phone? Have access to WiFi (i.e. built in on your phone)? And have access to GPS (built in on your phone or bluetooth GPS) ? And do you want to earn some rewards?
If so, you can help! Sign up here, download the software (link here), making sure you download the correct phone software and away you go.
See here for a screenshot of the data I've collected. Green point is unsecured WiFi point, red is secured WiFi point and blue is mobile phone mast.
Pretty niffy, eh?