http://mahout.apache.org

http://machinelearning.reddit.com

http://mloss.org

http://jmlr.csail.mit.edu/

http://shop.oreilly.com/product/9780596529321.do

http://www.amazon.com/Algorithms-Intelligent-Web-Haralambos-...

http://www.amazon.com/Mahout-Action-Sean-Owen/dp/1935182684/...

http://www.amazon.com/Collective-Intelligence-Action-Satnam-...

http://www.amazon.com/Machine-Learning-Hackers-Drew-Conway/d...

http://www.amazon.com/Machine-Learning-Action-Peter-Harringt...

http://www.metaoptimize.com/qa

http://stats.stackexchange.com

http://www.amazon.com/Collective-Intelligence-Action-Satnam-...

http://www.amazon.com/Algorithms-Intelligent-Web-Haralambos-...

There's really good books on Data Mining at Borders, and a recent bunch of "collective intelligence" books; the Manning books are excellent, but you have know java; you probably also want to install Weka and R, look at the Python suite (numpy, scipy, matplotlib), tools like that; also look up the ~107 (!) algorithms that Bellkor used for Netflix comp.

http://www.research.att.com/~volinsky/netflix/

http://www.amazon.com/Programming-Collective-Intelligence-Bu...

http://www.amazon.com/Collective-Intelligence-Action-Satnam-...

http://www.amazon.com/Algorithms-Intelligent-Web-Haralambos-...