4,000 science titles from the National Academies Press (NAP) now available as free PDF's (really, legally, direct from NAP, but registration is required...)

The National Academies Press Makes All PDF Books Free to Download; More Than 4,000 Titles Now Available Free to All Readers

"WASHINGTON -- As of today all PDF versions of books published by the National Academies Press will be downloadable to anyone free of charge. This includes a current catalog of more than 4,000 books plus future reports produced by the Press. The mission of the National Academies Press (NAP) -- publisher for the National Academy of Sciences, National Academy of Engineering, Institute of Medicine, and National Research Council -- is to disseminate the institutions' content as widely as possible while maintaining financial sustainability. ..."

National Academies Press (http://www.nap.edu/)

4,000 titles... That's going to take a bit to read... :P

(via Slashdot - National Academies Release Over 4,000 Free Science Books)