Click on: Classics index .
Online Psychology Books
Classics in the History of Psychology (OD)
More that 200 titles. If you find an author in Online Psychology Compilations that interests you, you might be able to find a whole book by them here.
Psychology: an Introduction (PsyW)
Introduction to Psychology Textbook by Dr. Russ Dewey Free ...
Endocrinology - NCBI Bookshelf (Wiki)
Hard-copy Psychology Books
MIT Book List
Here are two books which I thought were at least somewhat helpful but which were assigned for MIT courses which did not have any useful slides, PDFs, audio files or links and which I, therefore, eliminated.
Psychology, Gray MIT 9.00P (2001)
A well written overview of the whole field of psychology
Zen and the Art of Motorcycle Maintenance, Pirsig: MIT 9.68
I'm disappointed. MIT seems to be trying to be hip without really giving the emotions any genuine consideration. It's like their failure to have a course on the endocrine system while having more than a dozen on cognition. They're all head and no heart.
However, this book surprised me. It's extremely well written, and I read pretty much the whole thing, which is unusual for me. Unfortunately, it's not psychology. It's philosophy. It won't help you understand the emotions, but if you want a quick overview of classic Greek philosophy, give it a look.