Some useful tutorials that I appreciated and found interesting:
StackOverflow: Whenever you have a (good) question and need a (good) answer.
ped-net: should help people, who are interested in the field of pedestrian and evacuation dynamics, to find useful informations and to join other people with same interests.
Evacmod: This is the evacuation modelling portal for the simulation of human behaviour during emergency situations. The site is made by the evacuation modelling community for the evacuation modelling community.
Free, searchable chess game database
A quick tutorial on Traits, Traits UI and Chaco: This tutorial begins with a quick introduction to Traits and then presents and discusses a simple application.
Action Script: Nice collection of ActionScript tutorials, code, videos and more. . .