Look at this: some hackers have broken into the tv and, with an external hard drive, they've "transported" the OS to a 2.0GHz Macbook (Black)
Here, take a look:
http://www.appletvhacks.net/2007/03/27/apple-tv-running-on-a-macbook/
Here, take a look:
http://www.appletvhacks.net/2007/03/27/apple-tv-running-on-a-macbook/