inSSIDer

How can inSSIDer help me?
■Inspect your WLAN and surrounding networks to troubleshoot competing access points
■Track the strength of received signal in dBm over time
■Filter access points in an easy-to-use format
■Highlight access points for areas with high Wi-Fi concentration
■Export Wi-Fi and GPS data to a KML file to view in Google Earth.
■Filter through hundreds of scanned access points

http://www.metageek.net/products/inssider/