TubeMogul is a service (free) that I stumbled across while thinking about creating a vodcast (i.e. video podcast) for GovAccessMusic.com.
It allows you (after some setup work) to upload a video ONCE and publish it on several different video sharing sites.
Sweet!
For example: ONE upload now shows up on
Google Video
YouTube
Revver
MetaCafe
Yahoo Video
Daily Motion
Veoh
... plus others.
The links to revver and Yahoo aren't available yet.
The service even tracks views and clicks from all these other portals. It's a well-designed site that is easy to use.