News Mashup: Take a clip of broadcast news and replace the graphics and source clips to change the meaning of the broadcast.
You can also use this 
bookmarklet created by Joey Hagedorn to download Youtube content as QT.
http://vixy.net/ --- to rip videos off youtube and other sites
http://osvideo.constantvzw.org/ --- Open Source Video
http://corp.kaltura.com/ --- Online Video System
http://opensourcecinema.org/ --- Open Source Cinema
http://www.motionscript.com/ --- Motion Scripts for After Effects
http://www.smashingmagazine.com/2009/05/25/the-ultimate-motion-graphics-tutorials-round-up/ --- Motion Graphics Tutorials
http://www.modul8.ch/ --- for live video mixing
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