Note: About time.  I am glad ways to finally make a wireless card somewhat secure is a good idea.  Not sure why it took so long, they have had this hardware signature technology around for sometime.

MAC address spoofing on wireless networks could come to an end with a new security technique that would allow network administrators to see a unique WiFi fingerprints for each device. Carleton University researcher Dr. Jeyanthi Hall analyzed (pdf) the radio frequency (RF) signal of 15 devices and discovered that each and every device has its own unique signal—even devices from the same manufacturer—due to variations during the manufacturing process. The signals were so clearly different from one another that she had a 95 percent detection rate with zero false positives during her testing.