Most quality brands of NAS offer itunes library support, so it will stream straight off your nas without your pc being on. I will be interested once the guys over at XBMC get there hands on one and see what they can do with it. As stated there is a microusb port under the hdmi port, once hacked then this could be used for storage, and live xbmc

A unit that size with a 6w power draw running xbmc for $169 will be hard to pass up!