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You can add "pwn" to any you tube video to get a download link, e.g.:

http://www.youtube.com/watch?v=foobar

http://www.pwnyoutube.com/watch?v=foobar

Google Video also often offers download links.

Ok, that's really cool. I'll give that a try next time somebody sends me a youtube link. Thanks!

Turn off Adblock and you will see why.

I think you can download them, you just need to login.

RealPlayer Download add-on for Firefox helps.

For those of us who don't want to use RealPlayer, I've found that DownloadHelper does a fine job of downloading flash videos. It supports most of the video sites out there, and has a bunch of features in case you need them.

http://www.downloadhelper.net/

Again, a Firefox add-on.

I use both, and you are right: some may prefer one or the other.