Vision
originally submitted by Darin McGill:
"Vision" was (is) a groundbreaking work in the field of computer vision and neuroscience. It is the collection of findings of David Marr, who died before it was published. The book is out of print, and used copies sell for 300-400 USD. Neuroscience and computer vision is hurt by the copyright on this work, and benefits no one. See the Wikipedia article on Computer Vision for more details.
Stifled uses
Darin McGill:
Read it. Took me forever to get a copy.