I have gotten two which will download you tube youtube-dl & clive both are
command line programs clive is supposed to handle some other sites, but I
don't know. I downloaded a firefox and chrome plug-in but I can't find them
in either browser. I'm looking forward to other answers.

I use the Downloadhelper Add-on for Firefox. Another good one is 1-Click
Youtube Video Downloader. They work for me. Another way is to open your tmp
folder in the root directory and pull the flash from there. It will have an
icon indicating that it is a media file and start with F and then have 3 or
4 random letters. You can also get video downloaders for Chrome/ Chromium,
but I have not had as good luck with them.