Long-awaiting update to NetStumbler appears: The program's developer notes using extreme understatement: Since I released NetStumbler 0.3.30, I have experienced birth, death, illness, new job, and increased bandwidth costs. None of these will be helped by the arrival of both NetStumbler and MiniStumbler versions 0.4. Download and enjoy. Sorry it took so long.
The NetStumbler (Windows) and MiniStumbler (Pocket PC) applications let you scan for access points and record information about them, such as their unique interface address and whether security is enabled. You can pair scans with a GPS to build location-based awareness. [link via Gizmodo]
Simultaneously, iStumbler 84 was released for Mac OS X 10.3.