Just a heads up if it hasnt been pointed out yet - a great artist from dreamworks, richard smitheman, has put up his own animation clean-up blogspot and has posted a large series of his clean-up drawings from spirit, road to el dorado and rover just to name a few. His work is amazing and worth checking out. The link is below:
http://thepenciltestanimationcleanup.blogspot.com/
ENJOY
Cheers
ps: clean-up artists and the process is never given the credit it deserves - unsung heroes!