VIDEO COPLIT - a good website where we can find many AE tutorials

http://www.videocopilot.net/tutorials/

10 basic training tutorials about After Effect given by VIDEO COPLIT,  I think they are really useful for the beginner.

10 seconds branding animation for Skype by Monica Kim

Some motion graphic animations I like from Vimeo

Respublika. Motion graphics from CJ Basie on Vimeo.

Moviebox from BEELD.motion on Vimeo.