I always thought Zigbee and UWB were cool technologies looking for a problem to solve. While Zigbee might not yet have found a usage case, it seems Ultra Wide Band (UWB) has plenty to go for.

UWB is a high-bandwidth, short-range, ultra-low-power wireless technology. Current products average data transfer rates of 480 to 500 Mbps (millions of bits per second), but, even as you read this, developers are pushing the limits toward the gigabyte range.

For portable applications, the high-bandwidth and low-power consumption could bring a windfall of new features and applications for manufacturers of cell phones, handhelds, laptops, and personal navigation devices.

According to this article, UWB's ability to "see through walls" could make it a contender for in-building assets/people tracking or inventory management.

Sadly, right now Thales is using it only for military applications. 

Looks like a cross-over between RFID and Cell ID to me ...

See where it goes from there...