Here you'll find some useful scripts, most of them I wrote, and also tips that can really help you.
Iptables firewall Light firewall based on iptables
Batch image format converter (v 1.5, March 2004 - 11 June 2006, website of associated author). This script mainly converts format and size of images in given directory, to two subdirectories (two sizes). You can also specify destination directory, only resize pictures, generate an html index. It uses ImageMagick.
Debian installed packages categorizer (v. 1.0, July 2004). This script uses apt-cache and dpkg tools to say you in which "branch" your packages are (stable, testing, sid...). Execution takes minutes on a fast computer with 800 installed packages, but the goal is for example to correct packages that shouldn't be in sid, or useless libraries because sometimes libs change name when changing version. Then you have to manually understand the problem with apt-cache policy <package> and apt-cache rdepends <package> who will help you to decide whether to (re)install/force to a specific version or purge the package.
Get simply files from an USB removable device (v 1.0, 17 March 2004). This nice script mounts a device like a digital camera, gets files from a given directory of this device and places them into current directory. Then it unmounts the device.
