I’m too lazy to hack NetStumbler’s .ns file formats. But the summary text files are pretty nice. I’ve got a ns2xml PHP script which pulls the data out and converts it to XML. Then I have my JavaScript read the XML file and pass the data to Google maps for plotting.
The WAPs in red (and have a red marker) are encrypted. The ones in green are open. Click on a link to view the marker data (the map will recenter and show some additional info in a bubble). Click a marker on the map to view its data too.