As you know the XBox 360 won't play many of the most popular video formats such as Dvix and Xvid... That is to say Microsoft wants you to use their methods and codex. There is however an easy way to stream all your video content to your XBox without modding it. (assuming that you have your Windows based PC conected to your XBox360) First, download this free media sharing app called TVersity. Then Follow this simple guide. TVersity will "on the fly" convert popular video encoded video files to ones used by the 360. I've been using it and it works unbelievably well. If your Windows Media player can play a file, then you can watch it on your TV. (This will also stream music and picture files) Enjoy!