Useful links for computer stuff

LaTeX:

On-line LaTeX manual

Linux:

Linux Documentation Project
Linux Weekly News
AlphaLinux
Slashdot:News for Nerds. Stuff that Matters.
Linux on Laptops

Numerical simulations:

Numerical Recipes Home Page
Scientific Applications on Linux
GNU Scientific Library

Programming languages:

comp.lang.c Frequently Asked Question
C Programming (lecture notes)
The International Obfuscated C Code Contest

For young promising coders:

Cubetto - Hands on coding for ages 3 and up
Scratch - Create stories, games, and animations Share with others around the world
A Beginner's Guide to Programming Languages (thanks to Alex!)
Beginner's Resources to Learn Programming Languages (thanks to Tom!)

Internet:

Internet Traffic Report