A site called FreeTechBooks is offering free computer science e-books in non-DRM PDF. These are NOT pirated books – most are books with open licenses. There are books, textbooks, and lecture notes in a wide variety of well-organized technical categories, including computer science (as a science), programming, logic and circuit design, mathematics, signal processing, and even game development and multimedia. And *plenty* of books on Linux, naturally, including some O’Reilly titles that I recognize. Definitely a must-bookmark.
I am also adding this to my well-visited page on Free Embedded Linux Training, which I should probably rename to Free Open Source Training.