Yesterday I discovered a site that has free programming and computer science books:
http://techbooksforfree.com/

I remarked yesterday on my linkblog that it would be cool if some of those were available as eBooks.

I'm not actually a programmer per-se, so can I recommend these ones in particular:
http://www.reciprocality.org/Reciprocality/r0/
http://www.wtec.org/loyola/kb/

ps if you're really up for a challenge, how about Stephen Wolfram's 'A new kind of science'!
http://www.wolframscience.com/nksonline/toc.html

cheers, Richard (I already have a gmail a/c)
http://www.ebookculture.com