x.org documentation (extension tutorial)

[Matt Dew]

Hi all,
   Tapani Palli over at maemo has a nice little extension tutorial over at:
http://wiki.maemo.org/X11_Extension_tutorial

It's moving to Xorg's wiki here:
http://www.x.org/wiki/X11_Extension_tutorial

I'm not knowledgable enough (yet. ;) ) to help update this page.
Can people fill in the missing information?

thanks,
Matt