I’ve just come across this site. It lists hundreds of free eBooks, most of them Computer Science oriented. There’s a few advanced mathematics books on there, like “Categories, Types and Structures” and some EE books on DSP and circuit design, etc. All of them are completely free legal copies, released onto the Internet by the authors (all links take you directly to the author’s website, if you want to make sure) (some are drafts, some are out of print).
Hope somebody finds it useful.
Huh: it doesn’t look like it has an immediate use for me (most of it dealing either with issues I already have experience in and/or aren’t dealing with at the moment), but it has potential. And who can turn down free resources? Something I’ll definitely bookmark.
Thanks!
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Thanks for the link.
I always love the ones with titles that try too hard to be popular: Trigonometric Delights 
Pretty cool, thanks for posting a link.
Actually, I did get interested in Trigonometric Delights and have started reading it online. Guess funny titles do pay off.
I don’t use trig much any more, but I always wanted to know what problem parts of it were invented to solve.
"This book puts the history back into trigonometry and shows that what is often regarded as a collection of dry techniques is really a testament to thousands of years of human ingenuity and intellectual creativity.
Rejecting the usual descriptions of sine, cosine, and their trigonometric relatives, he brings the subject to life in a blend of history, biography, and mathematics. He presents both a survey of the main elements of trigonometry and an account of its vital contribution to science and social development. "
There’s also this book available if you’re into information theory and machine learning (it’s a recommended text for my machine learning course).
HTH.