HTC is pretty active in adding new, uncommon features, to its Windows Mobile devices. For instance HTC was the first (and so far the last) which added the JOGGR (see the::unwired's preview here) to its HTC Excalibur Windows Mobile Smartphone which replaced the jogwheel as used for ages. Now, with the HTC Athena (also known as T-Mobile Ameo or HTC X7500 Advantage), HTC added another technology it calls "VueFLO" which uses the G-Sensor which the Athena includes. Basically, the G-Sensor was designed to protect the hard disk from damages, in case the device drops or gets other shocks but the G-Sensor can also be used for navigating through the operating system.