The paper is licensed under the terms of the Creative Commons Attribution-ShareAlike 2.0 License, so you are free to redistribute and modify it, as long as you obey the terms of the license.
It doesn't appear to be available online, unfortunately.
I am somewhat proud to announce that an article written by me about the free CMS Drupal, has been published by the German Linux journal Linux-Magazin. It's available in their Sonderheft Linux-Magazin 2/2005: Web Edition (a special issue about web publishing).
Unfortunately the article is not available online, so you'll have to buy the magazine to read it.
My article gives a broad introduction to Drupal, covering the installation (and some troubleshooting) as well as the basic concepts like nodes, users, roles, permissions, themes, modules etc. I briefly introduce some important contributed modules, explain how one usually installs modules and give a short overview of what will be new in the next release, Drupal 4.6. There's also a tiny section about the history of Drupal, and I provided links to some interesting Drupal-stuff like the Custom Blocks repository (which has recently moved, so the URL in the article is wrong), the Drupal Theme Garden and the Drupal API documentation.
If you happen to have read the article, I'd be happy to get some feedback.
I have just created a small checklist in my security section about how to secure an Apache webserver.
Note that this is work in progress and will be improved as my time permits. Any comments or suggestions are highly welcome, though.