Use your USB keyboard and mouse with AppleTV, follow the multiple links/threads to figure it all out.
To those uncomfortable with command line bashing about: Abandon All Hope, this ain't for the feint of heart.
This is my mostly for-fun blog - I'm interested in doodling around with AppleTV, seeing what I can do with it and to it and run through it. My workaday site is HD for Indies, I write about high definition moviemaking over there and do consulting in that field. Contact me at mike [at] hdforindies [dot] com.