Here are links to stuff about Churchill written before this year.

Speak Out is his speaking agency.
John LeVelle has a couple of critiques of Churchill's writing. Look at "The General Allotment Act "Eligibility" Hoax: Distortions of Law, Policy, and History in Derogation of Indian Tribes" (It's a large PDF)
and the review of "Indians R Us."

I found some of this by searching the Rocky Mountain News for Ward Chuchill. See earlier links.