If you don't have a GPS already, and you're looking to do some war driving, this GPS device is pretty good.
Here is a map I created of the free Wi-Fi hotspots in Boise using the USB GPS and inSSIDer KML export utility. This google map uses the same kml file that goes into Google Earth. It looks much prettier in google earth.
Free Wi-Fi in Boise
For a free and open source solution, this is pretty cool. It doesn't triangulate the location of the AP; it puts them on the location where it saw the strongest signal. It also lacks the ability to interpolate the data.
I've also included a QR code for the WiFi Mapper Android App. It will do what you're looking for. So if you have the barcode scanner app, take a picture of the screen and it will download it for you.
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