This App allows you to use your Mac as a media server base, allowing you to play media content across compatible devices.
Plex can act as a media server for content streamed on the web and it boasts compatibility with the likes of the BBC iPlayer, Hulu, YouTube and 4oD. And can also store it locally. An Apple TV running Plex means that you would be making your AppleTV into a Google TV killer.
This hack is just a "proof of concept client" with a few known bugs.
Via PlexApp Forum