here's the full list of sources, find the URLs yourself asshats.

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2K Sports
5min Life Videopedia
Adult Swim
Apache Clips
Atom
BikerPunks
Blip
Break
CBS News
CBS Sports (AKA Sportsline)
Clarin
Clipfish
ClipShack
Clip.vn
CNN
College Humor
Comedy Central
Crackle
Crave Online
Current
Daily HaHa
Dailymotion
Dailymotion (Playlists)
Dark Orange
Diesel Bombers
DisneyTube
DivShare
Dorks
EA Sports World
eBaums World (Videos)
eSnips (Videos) 
ESPN
Facebook
FanDome
FileCabi
Flektor
Flickr
FloTrack
Flowrestling
Fox News
FQuick
Funny Or Die
G4TV
Game Trailers
GameSpot
GameVideos
Giant Bomb
Globo
Google Video
Grapheine`s BombayTV
Guba
Guitar-Tube
H3Press
Hulu
I Am Bored
IGN
iKlipz
ImageShack
Izlesene
Izleturk
JibJab
Joe Cartoon
Jokeroo
JustinTV
Koreus
Last.FM
Layartancap
Libero
Live Video
LiveLeak
Magnify
Media Matters
MegaVideo
Metacafe
MLG: The Game Room
Motionbox
MotorsportsMad
MSNBC
MTV
MTV Music
MyModelTalk
MySpace
MyVideo.Co.Za
MyVideo.De
Newsclipper
NFL
Nollywood
NothingToxic
PC Planets (MetaCafe Videos)
PC Planets (YouTube Videos)
Photobucket (Videos)
Photosynth
Poker Tube
Porkolt
Pure Pwnage
Putfile
Raw Vegas
Rediff
Revision3
Revver
RuTube
Sclipo
Sevenload
Social Paintball
South Park (Clips)
Speedaholic
Spike
Spiked Humor
StreetFire
Tangle
The Colbert Report (Clips)
The Daily Show (Clips)
The Escapist
The Onion
The WB
TinyPic
Today's BIG Thing
Trailer Addict
Tu
Tudou
UOL
UOL Mais
UOL Videolog
Ustream (Live & Recorded)
Veoh
Viddler
Video Tube
Video.Mail.Ru
VideoJug
Vidiac
vidiLife
Vimeo
VistaKU
Vreel
Wall Street Journal
Wat.TV
WeGame
World Star Hip-Hop
Xfire
Yahoo!
Yatahonga
YouKu
YouKu (Playlists)
YouTube (with Deep Linking support)
YouTube (Playlists)