I'm sure many of you have heard of this tool before but for those who haven't its an App for the Iphone and Ipod Touch. using the GPS on the phone it lets you map out the location of wireless AP and export them as KML files so that they can be seen on Google Earth.
I have plotted the location of WIFI AP around where i live (don't ask why... i don't even know myself. lol). and i find it be be a very good tool. Just don't do what i did and leave it scanning while in your pocket. the phone was like hot potato and i will probably never have kids again, Anyway. I reccomend anyone who hasnt allready to check it out.
http://jamesdotcom.com/storage/other/wififofum.jpg
http://www.aspecto-software.com/wififofum