I just wandered onto mathoverflow.com and checked the fourth (subject to resorting by activity) question on their front page:
http://mathoverflow.net/questions/1722/free-high-quality-mathematical-writing-online The first comment on that question led me to: http://www.e-booksdirectory.com/mathematics.php a page listing 452 free mathematics books. The second comment led to: http://mathoverflow.net/questions/761?sort=votes#sort-top a poll on the best undergraduate math texts. The third comment led to: http://people.math.gatech.edu/~cain/textbooks/onlinebooks.html a list of 76 online math texts, introduced by: "The writing of textbooks and making them freely available on the web is an idea whose time has arrived. Most college mathematics textbooks attempt to be all things to all people and, as a result, are much too big and expensive. This perhaps made some sense when these books were rather expensive to produce and distribute--but this time has passed." Then began the actual answers to the question, which has slipped to 8th place on the front page while I've been exploring. -- rec --
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