YouTube Downloader can download videos from these sites:
Last updated 10/2/2009

YouTube
MyspaceTV
MSN Video*
Yahoo Video
BadJojo*
Blip.tv
CollegeHumor
Crackle*
Ebaumsworld
Filecabi.net*
FunnyOrDie
Pornhost
PornoTube
Revver
Spankwire
Streetfire.net
Tube8
Vimeo
Xhamster
Youjizz
Yuvutu
* indicates partial support for that site due to mixed content on the site or other irregularities.


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Recently added / fixed support for in version 2.5:
Youtube
FunnyOrDie
PornHost
Revver
Spankwire
Tube8
Vimeo


Currently broken / on the to-do list:
AOL Video
Break
DailyMotion
Google Video
Guba
Hulu
Imeem
keezmovies
Liveleak
Livevideo
MegaVideo
MetaCafe
MSN Video
RedTube
Pornhub
Shufuni
Tangle
Veoh
XNXX
YouPorn


The supported web sites above are constantly changing. If you find a site that used to work but doesn't work any longer, please tell me.