YouTube has become the place to go for video on the web. However, if you want to download and reuse video from YouTube, you usually run up against two issues: 1) How to download the file; and 2) How to get the file into a format that is usable.
There are several web-based ways to download and convert YouTube video, but this little application is the best I’ve found so far. TubeTV gives you a browser-like window to search YouTube (and other popular video sites), and then “grab” the video and convert it according to the settings you specify in the Preferences.
This process saves a file to your local drive that is ready to be viewed. I haven’t found anything else that works so well and makes it so simple.
See this article on hacking Apple TV to enable SSH.
Check it out: TubeTV