NetSurveyor is an 802.11 (WiFi) network discovery tool and, as such, its goal in life is to gather information about nearby wireless access points in real time and display it in a useful way. Similar in purpose to NetStumbler, it includes many more features. The data is displayed using a variety of different diagnostic views and charts. Data can be recorded for extended periods and played-back at a later date/time. Also, reports can be generated in Adobe PDF format.....(free).....