If your question is not answered in the FAQ, you can try a web search. The
following search engines are especially useful:
http://www.google.com/
http://search.yahoo.com/
http://www.altavista.com/
http://citeseer.nj.nec.com/cs

Another excellent web site on NNs is Donald Tveter's Backpropagator's Review
at http://www.dontveter.com/bpr/bpr.html or 
http://gannoo.uce.ac.uk/bpr/bpr.html. 

For feedforward NNs, the best reference book is: 

   Bishop, C.M. (1995), Neural Networks for Pattern Recognition, Oxford:
   Oxford University Press. 

If the answer isn't in Bishop, then for more theoretical questions try: 

   Ripley, B.D. (1996) Pattern Recognition and Neural Networks, Cambridge:
   Cambridge University Press. 

For more practical questions about MLP training, try: 

   Masters, T. (1993). Practical Neural Network Recipes in C++, San Diego:
   Academic Press. 

   Reed, R.D., and Marks, R.J, II (1999), Neural Smithing: Supervised
   Learning in Feedforward Artificial Neural Networks, Cambridge, MA: The
   MIT Press.

There are many more excellent books and web sites listed in the Neural
Network FAQ, Part 4: Books, data, etc.