For a good description of Bluetooth and a comparison with infrared, see www.countersys.com/tech/bluetooth.html.
Or go to the Bluetooth web page at www.bluetooth.com.
Get information on WiMax from the WiMax forum.
The FCC has a webpage on 3G wireless systems.
Category 7 wire is still in its infancy, so you may have to do a Google search on Category 7 utp to get the latest.