FireHOL is a stateful iptables packet filtering firewall configurator. It is abstracted, extensible, easy and powerful. It can handle any kind of firewall, but most importantly, it gives you the means to configure it, the same way you think of it.
There are several ways to shut down DebianLinux machine cleanly, with the most simple probably being from the GUI environment you are using.
For the GNOME desktop enviornment there is the option to shutdown the machine which is immediately available when you click "Logout". Choosing this should log you out of the desktop and also shut the machine down
If you're storing anything in databases that you do not want to lose, chances are you should be doing weekly or even daily backups. Depending on what you are using your databases for, be it to store forum messages, employee information, or your spending information, you are going to need to choose a backup that meets your needs.
Security, speed, compliance, and flexibility--all of these describe LightTPD which is rapidly redefining efficiency of a webserver; as it is designed and optimized for high performance environments. With a small memory footprint compared to other web-servers, effective management of the cpu-load, and advanced feature set (FastCGI, CGI, Auth, Output-Compression,URL-Rewriting and many more) LightTPD is the perfect solution for every server that is suffering load problems. And best of all it's Open Source licensed under the revised BSD license.