Math

http://www.cs.bc.edu/~straubin/cs381-05/blockciphers/rijndael_ingles2004.swf very cool flash animation that shows you how RIJNDAEL chiper works, step-by-step!

http://habrahabr.ru/blogs/artificial_intelligence/74326/#habracut Different approaches in using neuron networks for OCR (optical character recognition) – an article in Russain

http://algolist.manual.ru/ Web site [mostly in Russian] about algorithms that are used in software development

http://www.random.org/ :-) here is your web.20 /dev/urandom

http://science.slashdot.org/comments.pl?sid=362251&cid=21373411 interesting summary and discussion on a recent paper by Garret Lisi: an attempt to explain elementary practicle grouping by a complex geometrical model