Here are some NLP/ML/AI links:

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

http://jmlr.csail.mit.edu/papers/special/feature03.html

http://www.daviddlewis.com/resources/testcollections/rcv1/

http://www.ai.mit.edu/projects/jmlr/papers/volume5/lewis04a/lyrl2004_rcv1v2_README.htm

http://www.cs.berkeley.edu/~klein/cs294-5/index.html

http://www.kamalnigam.com/