Photoshop related:
Starring artists that use photoshop

Straznitskas.com
This man wrote a very helpful book

colorize.com
Check out this one

Adaweb.com
The web site with art perspective

Qlaser.com
How did they do that?

Trumania.com
Daily needs freebies

Entropy8.com
You've got to see this one

1frestuff.com
A website with free stuffs

Desert.net
THIS... is a net

Hotwired.com
Learn without book here

Si.edu
I've just got to learn this one