Comparison of the legal terms / conditions of popular video hosting sites. Looks like blip.tv comes out ahead.
Kaltura is an open source video collaboration tool. It integrates with MediaWiki to allow wiki-like editing of videos. The software is open source and hosted on sourceforge.
Viddler is a video publishing web site with some advanced features. Tag points in a clip, upload directly, etc. It's like YouTube improved.
KickApps is a white label social networking / video hosting platform. Free to sign up, ad supported, or you can buy the ads out, starting at $100/mth for 5'000 page views.
Video broadcasting through flash from your mobile, video camera, web cam, etc. It's like YouTube but live data (I think).
Create screencasts and upload them immediately as flash videos. Windows or MacOS X only, no Linux client. You download a client app to record the video.
Create your own YouTube using opensource tools.