i have a couple friends who hail from the windows world who are interested in understanding how graphics work in linux. and by "graphics", i mean, "ok, what is this 'X' stuff, and how does it work, and how do you configure a graphics card, and what's all this 'AIGLX' and so on?" is there, somewhere, an entry-level writeup that starts with the basics and takes off to cover all of this up to the current advanced stuff? thanks. rday