Interesting article by Oriol Vinyals and Quoc V. Le on Chat Bots and Natural language processing (NLP): http://arxiv.org/pdf/1506.05869v1.pdf
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Another great source on NLP: https://www.reddit.com/r/languagetechnology
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Interesting article on Inverse Reinforcement Learning (IRL) in Swarm Systems: http://arxiv.org/abs/1602.05450
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Some sources on Cleverbot, Mitsuku and Facebook M chat bots: https://www.reddit.com/r/artificial/comments/46slso/artificial_intelligence_in_the_cloud/
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ML Python books: https://www.reddit.com/r/MachineLearning/comments/46vz4k/good_machine_learning_book_with_python_for/
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Some data sets: https://www.reddit.com/r/datasets; http://academictorrents.com/; https://www.reddit.com/r/MachineLearning/comments/46x56i/is_there_health_data_available_similar_to/