If you have an iOS device of any kind, I'd highly suggest downloading an app called Air Video HD. After you download it, you can download a desktop client for it that acts as a server, and you can stream any video on your computer to your Apple TV through Airplay. WAY more convenient than the jailbreak/XBMC ordeal. That turned into a headache for me. Eventually, I said screw it and went legit. I won't jailbreak my Apple TV again until I have a very compelling reason to do so. PM me if you have any questions.