The link below will take you to an english college website. Its got a wealth of knowledge from encryption to optimizing for intel chips and a host of ebooks on certain programming languages. If you have something similar to share then please add it to this thread. Cheers:)
http://www.comms.scitech.susx.ac.uk/fft/ (http://www.comms.scitech.susx.ac.uk/fft/)
No prob enjoy =D