How to Download Videos from YouTube, Google Video, Blip.tv, MySpaceTV and More

Simple: Go here, and enter the video's URL.

Note: To view the resulting file, you'll need a FLV player, many of which are freely available online.

See also Vixy.

Update (10/1/07): Thanks to Dave Almacy for alerting me to Zimzar, a Web site that, for free, converts videos from all the major video sites.

Update (10/4/07): Todd Ziegler recommends Keepvid.