This is Inferno, a multi-purpose, multi-boot dedicated server.
This box doesn't see much usage nowadays, but I used to run it 24/7 as a dedicated file sharing server (via both P2P and FTP) as well as a dedicated game server host.
It also has multiple operating systems installed and linked through GRUB:
It used to have Solaris in place of Vista, but it was removed because Solaris is just an awful operating system and resulted in partition corruption when I attempted to modify it using a partition manager.
I control my servers remotely using TightVNC
from any computer connected to the local network.
I recently modded a custom fan controller module into an empty optical drive slot cover to control the three 80mm case fans on the side (1x) and back (2x) via toggle switches.
A collection of all the wiring used in the fan controller mod. To make the mod plug 'n' play, you can remove it by disconnecting the 9v clips from each other.
Another angle of the fan controller. Wire was recycled from fried power supplies, and solder was covered in hot glue to prevent electrical contact with other components.
Installing the fan controller into the optical drive slot.
A final test run of the mod to make sure everything works.