Pencil...

I going to start trying out 'Pencil' an open source animation software.  I was looking at Adobe Flash CS software and was shocked at the prices.. Flash CS4 costs $999 :O. Pencil looks neat and impressive so far (interface has been done using Qt), will probably post an animation made with it shortly...

Pencil can be downloaded at http://www.pencil-animation.org/index.php?id=Download