Dude...
Nice job with utilizing 3d backgrounds. When producing this, did you key in the animations in 3d space and used the 3d program's camera to render, or did you just move the camera around the 3d space, render it, then add in the animations later?
Just curious, as I had an idea of doing the latter (with 3ds Max).
Either way, I like it, although a toon shaded filter would have allowed your characters to blend in a little better with your background/foreground items.