Hide Tanning: Maine Primitive Skills ; Good video on wet scraping.
Brain Tanning Hair On- Part 1: David Canterbury: Process from rawhide stage. Good demonstration of preparing brains and braining hide.
Deerskins into Buckskins; Matt Richards Is is a DVD course for sale. It is excellent and takes you step by step through the wet scraping process.
Introduction to Bark Tanning; Buckskin Revolution: Great step by step from a woman with extensive experience.