This is a map of known Austin wireless hotspots taken largely from the list at Austin Wireless City's site: http://www.austinwirelesscity.org/hotspot-list.php.
I built this using code written by Greg Stoll. A Great big thumbs up to him for his inspiring work.
You can email me comments or hotspots that I don't have on here (I have to add the libraries - just haven't done so yet) at ramseyp@southwestern.edu.