Adam and I have been doing research on wireless security from a practical perspective. Basically discovering what's wrong with the current security models in 802.11 networking and how they can be fixed or worked around.
Adam has developed a system called the Captive Portal that will allow wireless networks to be setup that are resilent to problems with link-level authentication and encryption schemes. The system is still in development, but will be "released" by conference time (as much as open source software gets released ;). In the coming months we will be writing a paper on the Captive Portal; how it works, what it's strenghts and weaknesses are, and instructions on getting one going.
I will give the first part of the talk, Adam will give the second part the part that deals directly with the Captive Portal.
We will also setup a wireless network at DC so folks can try and hack the portal. We're always looking for ways to improve our idea.