I saw an interesting post this morning...

IDT Spectrum announced last week, that it is accepting offers for its holdings in 38-GHz and 28-31-GHz spectrum licenses. These licenses are in the top 25 markets of the United States, and also include a good portion of spectrum in the New York City market. Some noteworthy press has come out about this lately.
According to an article in Information Week (and some other publications), the spectrum issue has caught the attention of the chairman of the Federal Communications Commission, Julius Genachowski, who has said there is a "looming spectrum crisis."

According to the same article, the move comes as the industry is increasingly questioning if there is enough spectrum to handle future mobile data needs, particularly as devices like the iPhone lead to data-hungry applications. For example, AT&T said its wireless data traffic has increased by more than 18 times over the past two years. The article noted that this trend is expected to continue, as Motorola recently said nearly 40 million American consumers actively use mobile Internet services, a 75% increase from just two years ago.

In another article from Wireless Week, IDT was quoted as indicating that it wants to sell the spectrum as a single nationwide bundle as opposed to a market-by-market approach. Besides Tier 1 or other wireless carriers, the article noted that cable companies might be interested in acquiring the spectrum, as well as tower companies that want to compete with FiberTower, which owns similar spectrum.