I found this link from Slashdot, it's an article on how the electromagnetic spectrum is sliced and divided up among controlling parties. It mentions the FCC's latest partitioning of certain frequencies to Nextel. Also mentioned is the 802.11 "open frequencies", and others.
The article gives a bit of insight as to how the current frequency partitioning mindset came to be, and offers alternatives.
A good read for the curious.
...and another take on Spectrum rights and permissions.