The next "new" thing has arrived (sort of)--streaming audio files (music) to the handsets.
When service providers were looking to increase their average revenue per user, also known as ARPU, they decided to add cameras to their phones. The idea was to have users take pictures, then send/transfer those pictures over the cellular network, thereby using more air time.
The studies show that that hasn't really been the case, at least here in the US. The usage model for these camera-phones is that they get a lot of use in the first month or so that they're purchased. Then the use wanes considerably.
The next "new" thing has arrived (sort of), and I think this one has a lot more sticking powerstreaming audio files (music) to the handsets. The Motorola-Apple ROKR handset is a great first step, but I think they missed the boat. This phone, which doubles as a pretty decent MP3 player, gets it's music by synchronizing with a PC, rather than from the cellular network.
The best solution would have been to offer either option (as well as a third Wi-Fi option). In this scenario, the user could download the music from the anywhere in the world, using the fastest transfer rate at his disposal.