Here are a few sites where you can gain some exposure for your work.

Atom.com
blip.tv
Break.com
Clipshack
Citytv.com.co (Spanish)
Dailymotion
EngageMedia
Flickr
Globo Video (Spanish)
Hatena (Japanese)
iFilm
imeem
Metacafe
MoboVivo
MyVideo
OneWorldTV
Openfilm
Ourmedia
Ovi
Phanfare
Putfile
Qik
Revver
ScienceStage
showmedo
Spike
Stickam
Tudou (Chinese)
Veoh
Viddler
Vimeo
vzaar
Yahoo Video
Youku
YouTube