Useful Motion Tutorials

Tutorial I used for last year's work  - to make a handwriting effect

http://layersmagazine.com/animated-handwriting-in-after-effects.html

Showing particles moving:

http://library.creativecow.net/articles/rabinowitz_aharon/CC_Looping_Particles/video-tutorial

Not had a go but this looks cool:

http://www.youtube.com/watch?v=h3bf0ULF2m0&feature=related