Here’s a nice piece about UWB. There are different visions of UWB right now, ranging from cable replacement to a full-scale IP network, so we don’t know how it’s going to play out. But recent agreements between WiMedia and Wireless USB and Bluetooth indicate it’s not going to be another powerline network.
UPDATE: I ran into a WiMedia officer to day who said he hadn’t seen this story, so I naturally enouraged him to check it out. It is Markoff, after all.