As others have mentioned, progressive download is just a file like a 5MB Jpeg
as far as the browser is concerned. The reason youtube can get away with this
is the majority of content is small (a few minutes) and heavily replayed so
progressive is a much better deal. Google on the other hand has some hour long
videos and wants to index them so jumping around makes sense. 

Streaming 
- need to be able to jump to any point:  not needed in youtube, most videos are
small, played from start to finish
- care about DRM
- have extra overhead for streaming media servers
- don't care as much about repeat plays (since nothing is ever cached on the
harddrive...ever, every second of video has to come from the server)

Progressive
- no need to jump ahead of what's downloading
- can use conventional edge servers (e.g. akamai) with normal webservers to
accelerate downloads
- want to avoid replay bandwidth costs.
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