I've heard that with DTV, the entire analog television spectrum will fit in the space between channels 5 and 6, and those low frequencies can be used for things like wireless internet is able to travel greater distances and travel through walls.
Interestingly enough, there is quite a fight to get a DTV tower up in Denver, Colorado, by a group formed by all the TV stations in Denver. Instead of one tower per station as it is now, they all plan on having their DTV antenna's on one tower. But, of course, and environmentalist group is preventing that from happening.