Besides After Effects, what other apps are similar to Motion on the pc? I enjoy using motion's simplified interface but enjoy using vegas too much to make the switch over to mac. Thanks!

Combustion, maybe?
http://www4.discreet.com/combustion/index.php

Discreet (Autodesk whatever now) Combustion and Adobe After Effects.

Vegas, to a certain degree. 3D compositing, bezier masks, track motion and pan/crop go a long way if you use a little creative elbow grease. Couple them with some of the better filters and scripts out there, and you've got a large number of things people turn to an FX/compositing app covered.

Check out Satish's Wax, the Zenote plugins, and Pixelan's stuff. Vegas 6 comes with some Boris goodies, too.

Also, brush up on VirtualDub and AVISynth -- there's a WORLD of possibilities frameserving from Vegas to them.

- jim