Wow, thanks for the such informative write and link, CrazY. We really should sticky these highly valuable, one of a kind websites such as
http://the303.org/,
http://hl.loess.ru/,
http://bots-united.com and others so that it's easier for us to find resources. I'm sure there are more of these sites but unfortunately they get unnoticed and never got passed down to next generations of amxx coders. We really should gather these sites in a thread and make a sticky!