I think it turned out pretty nice. Most of it was made using bones. The eyes and mouth shapes were created using point manipulation.
I'm going to create a blog post soon chronicling the making of this little bumper. There's actually more to it then you'd think.
I also included the storyboards which I stick pretty close to. The rig I built is fairly simple to use but you can do a lot with it which is why I'm eager to try out more stuff. My aim is to give my work a more three dimensional "feel" while still maintaining a 2D "look".