Attach a highspeed microSD card reader (or build one in) and this would make a very compelling low power, personal media file server. Although needing to keep the television on to power it might get annoying.
I see this device as the perfect next-generation-chromecast.
You can download anything you want wirelessly and play it on your HD TV. No need for Chromecast to load youtube and be a "closed garden" of google.