Videos and video editing is a pet project of mine, so I like to keep track of what’s going on in the industry.  At several conferences, I’ve seen Jumpcut profiled as a nice resource for people who don’t have a video editor on their PC, or need to do some video editing while they’re away from their ‘puter, etc.  Those days are done, apparently:

http://www.techcrunch.com/2008/12/17/yahoo-putting-jumpcut-in-the-deadpool/

I won’t miss it that much - i tried it a couple times when i was having trouble with my home computer’s ability to make movies.  It always seemed very clunky to me, but maybe that was because I was used to a different editor.  I think it would make more sense if existing video sites offered the ability to fully edit videos as part of their service.