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.