Dear Brutus and ChriZ and Charlie...
@Brutus: I can't say much, but exactly what you ask for is coming, and we'll have it in the shops this Christmas, at least in some territories, and whenever there's DTI approval, it'll be ready here soon after.
@ChriZ: 480mb/s is the raw data rate that goes over the air, and it does actually do all that. As in all networking products, the raw air rate doesn't tell you everything; for a start, there's a lot of coding, error correction, and encryption overhead; but even after all that, it still consistently beats wired 100 megabit ethernet in real-world measurements.
@Charlie: The whole point of UWB is that it uses a variety of radio technology that allows you fast data rates at minimal power levels. It's designed to be low power so that it can be useful in battery-powered applications like cameras, phones and PDAs; if it killed the battery life, no-one would want it! The whole thing about using very wide bandwidth is that it's the area *under* the frequency-power graph that matters, and a signal that's very wide can carry just as much information at a *far* lower level than your normal narrow-band radio. Just FYI, the operating levels of UWB radios are a good few dB *below* the background noise levels!