Here is an article from the last IETF Journal (vol. 6, no. 1, June 2010) http://www.isoc.org/tools/blogs/ietfjournal/?p=1746

We have received the shipment from Ettus Research including a fair number of USRP2s (Universal Software Radio Periperal) as well as boards and antennas to conduct research on different environments as well as different scenarios. As a first go, we are planning on using the USRPs to test our wireless video broadcasting solution.