Digital Video Guru is running a comparison of 10 digital video sharing sites - EyeSpot Beta, Google Video Beta, Grouper Beta, Jumpcut Beta, OurMedia, Revver Beta, VideoEgg, Vimeo, vSocial and YouTube. Here's an excerpt:

For posting: If you just want to get a video clip online and share it with friends via email or on your own blog, Vimeo wins for its speed, ease-of-use, and simple playback functions.  It also lets users download the original file, and features some light community features (note that a new version is launching very soon).  One of the few sites I used that I never had a problem with.  Alternate choice: Videoegg.

For viewership: If you want to step up to more community features and get widespread viewership of your viral clip, YouTube gets the job done with a lot less hassle than vSocial or Grouper.

For editing: If you want to alter your video online in any way--through editing, remixing, or combining your clips with those from other users--then head on over to Jumpcut and don't look back.  Jumpcut really offers the first leap forward in online video sharing, and its worth a look even if you have no use for editing features (and its community features are launching "very soon").  Alternate choice: none, yet, although Motionbox looks to be a potential competitor.