Here’s how to save Youtube.com videos to your hard drive.
1. Find the “video ID” of the clip. You can get this from the video’s URL.
2. Type in “http://youtube.com/get_video.php?video_id=XXXXXX” except replace XXXXX with the video ID.
Here’s an example: (Aztec Camera "Oblivious")
http://youtube.com/get_video.php?video_id=bGkL913dVCc
3. You will be prompted to save the file to your hard drive. After saving it, change the extension of the file to “.flv”
4. You need the flash player to play the file that you just saved. Get one here:
http://www.rocklists.com/flv.zip
Edited 3/8: Changed the example, since someone apparently removed the last example video...