After disappearing for a while due to a fair use scuff-up, the aTV software that helps turn the Apple TV into the media center it should have been is now back and freshly updated. Big new features are a GUI installer for loading the hack onto a USB stick, eliminating the messy command line work that used to be required, and support for external USB devices for connecting a bigger hard drive or NAS for more storage, on top of everything else this nifty unofficial upgrade does for your Apple TV.
https://gizmodo.com/atv-one-step-apple-tv-hack-gizmo-discontinued-394177
Mplayer codecs mean you can handle just about every file format you can find (including uncompressed VIDEO_TS rips). Other add-ons include the Sapphire media organizer, a WebKit browser, game emulators, the ability to FTP into your box to avoid iTunes and more, all without blocking any of the out-of-the-box functions. Not bad at all for $60. [aTV via 43 Folders]