Create a Stunning Website Demo Presentation - Aetuts+
http://ae.tutsplus.com/tutorials/motion-graphics/create-a-stunning-website-demo/
16 Killer Motion Graphics Demo Reels - Aetuts+
http://ae.tutsplus.com/articles/inspiration/16-killer-motion-graphics-demo-reels/
Reel Roulette
http://reelroulette.net/