New appication for USRP+GNU radio, free subway rides
http://www-tech.mit.edu/V128/N30/subway/Defcon_Presentation.pdf
Well, at least until people learn to deploy secure systems.
As a side note, there was also a Blackhat presentation in which
someone presented the basics of SDR using the USRP/GNU Radio
combination. It was pretty basic, but I thought it was nice to peak
peoples interest in SDR a bit.
jeff