I recently installed a new server with Ubuntu as operation system, on that I installed phpsysinfo, which made my client freeze, it also displayed a lot of things I wasn't interested of. So I came up with the idea to make my own system information script (UbuntuInfo).
UbuntuInfo is simple to use and built using modules. If you know how Ubuntu works and also know how to code PHP you can easily create your own modules to show.
The script looks like the picture to the right (click on it for bigger picture), is 57kb in size (7zip doesnt compress tar files good) and can be downloaded from here:
www.redward.org/files/ubuntuinfo-v1.0.tar