For anyone interested in learning algorithms (and not just free books), I would also suggest Pattern Recognition and Machine Learning by Chris Bishop. Not free,

For anyone interested in learning algorithms (and not just free books), I would also suggest Pattern Recognition and Machine Learning by Chris Bishop. Not free, but worth while. http://research.microsoft.com/en-us/um/people/cmbishop/prml/ http://research.microsoft.com/en-us/um/people/cmbishop/prml/