I'm going to talk more about Blender, the amazing free 3D program later. I downloaded it a few weeks ago, and I've been playing furiously. Right now, I'm in the midst of modeling a killer whale cartoon. Here is the character (in progress; no fluke yet):
As I complete it, animate it, and begin new projects, I'll post them, too, but right now, I'm just really excited about the possibilities here.