Neural Network FAQ
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This was written by Warren S. Sarle from 1997-2002. I ran into it while trying to look for papers on benchmarking neural networks. I highly recommend it for its frank and accessible style.
http://www.faqs.org/faqs/ai-faq/neural-nets/part1/
http://www.faqs.org/faqs/ai-faq/neural-nets/part2/
http://www.faqs.org/faqs/ai-faq/neural-nets/part3/
http://www.faqs.org/faqs/ai-faq/neural-nets/part4/
http://www.faqs.org/faqs/ai-faq/neural-nets/part5/