The Ghost in the Time Machine
Mac mini with snow leopard server running headless, time machine hack.
http://www.macosxhints.com/article.php?story=20081013105501329
Updated for version 10.6, Snow Leopard Server on a mini. Also this was not using ARD, it was using standard screen sharing (VNC) client.
Before the drag and drop, can kind of sort of see that something happened when time machine is invoked over screen sharing, but not usable.
Drag and don't drop any file, from client desktop to server desktop window -- then a ghostly appearance of the full time machine GUI.
Just a few days late for Halloween.
If you didn't know already, headless means no monitor, keyboard, or mouse. The machine is setup, configured and accessed via a network connection to another computer that has the necessary human interface components.