Most that looks like it could be done with animating the paths of shape layers. Andrew Devis has a lot of tutorials on Shape Layers that might get you moving down the right path.
Johnny Cuevas, Editor
"I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work."
---THOMAS EDISON on inventing the light bulb.