inSSIDer is an award-winning free Wi-Fi network scanner for Windows Vista and Windows XP.
What's Unique about inSSIDer?
* Use Windows Vista and Windows XP 64-bit.
* Uses the Native Wi-Fi API and your current Wireless network card.
* Group by Mac Address, SSID, Channel, RSSI and "Time Last Seen."
* Compatible with most GPS devices (NMEA v2.3 and higher).
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.
NFO and download page:
http://www.metageek.net/products/inssider