One of the coolest things about Flickr video: 90 Second limit. This has really helped my think about the people who watch the video (my audience) and keep the whole idea of "being fair" to them when I'm editing video footage.
With the Flip's generous storage (1 GB, about 60 minutes), it would be far to easy to just let the camera roll for minutes and minutes, but keeping the 90-second Flickr Video limit in mind makes me conscious of getting the shot I want and moving on.
I have always been a fan of video, you know, ever since my middle-school days stealing time on the linear editing decks from the school library, and Flip Video plus Flickr video has invigorated my desire to create moving pictures.

This video started with exactly Flickr's description of the "Moving Photograph" concept in my mind. I wanted to shoot something that would be inherently more interesting if it could move. A still photo certainly could have captured the same sense of isolation and indifference the ramen feels toward Pick 'n' Save shoppers, but without the stream of people walking by in the background -- people painfully indifferent to the way the ramen hates them -- would the Ramen's rage have been as potent?
Oh, yeah. And then there's the music.
Maybe Flickr should do some kind of mix tape service?