This site isn't a "normal" site in the sense of being a collection of static web pages. Instead it's a micro Content Management System that generates web pages on the fly in response to requests from web browsers. And while its micro as far as the amount of programming code used to make it work, it is not small conceptually. The ideas behind it are no different than those behind some of the really big content management systems like Drupal, Joomla, and Lenya; or blogging systems like wordpress, and b2evolution; or wiki systems like MediaWiki (which runs Wikipedia). But of course, this is just a little bitty program compared to those giant systems. It is without the editors you can use from your browser, or the many database functions like keeping page revision histories and contact lists, or the templating functions so you can change the look of the site with one click. There are hundreds of other things you can do with some of those systems.
Content Management systems are the wave of the future and there is a huge list of them, some of which are set up on this site. You can follow the navigation links under Demos to see some rudementary installations not yet having much content to show what they can really do. If you are interested in particular content management systems you can visit their web sites where you will usually find links to better examples.
As you might have guessed, I am only using open source systems because I think that open source software is better than proprietary software in the same way and for the same reason the science is better than opinion. And by better I mean easier to use, faster, more stable, and not least of all more fun. I started testing linux years (and years) ago but for various reasons didn't have time to really get a system working. I wish I had, because now that I finally sat down and learned it I am rediscovering why I got into computers in the first place: its fun. If you're not familiar with the term open source, or with the linux revolution currently going on, you can check out the wikipedia open source or linux articles. Oh, I still use my old windows sodware for games since I'm not comitted enough to buy a console. But for any serious work I turn to my Ubuntu linux system without which I probably wouldn't even be doing this. Thanks to all the wonderful programmers of the open source community who have and who continue to do this amazing work and to all those who support them.