UWB is a great idea for a cordless phone replacement: The chance of interference is about nil, and while UWB needs short distances for high speeds, it can actually maintain decent speeds--certainly high enough for voice codecs--at much longer distances, such as throughout a typical modern home. If you already have a UWB hub or infrastructure for home entertainment, this isn't that weird an idea. ZigBee, 802.11n, and other technologies may bite deeply into parts of home entertainment management and streaming, however, before UWB is widely enough deployed. (Why do you think MIMO is so big, so fast? Streaming video, folks, streaming video.)