Mark Harris, from the UK, received the Special Edition of GTA IV and constructed something incredible out of it.
He actually got the idea of using "The donor PC" (with Slax as OS, and a 1GB CF card connected to the IDE controller with a Compact Flash Adapter) to fit in the case that came along with the Special Edition.
This resulted into a fully-operating system, a real, true GTA-PC.
Of course he had to make changes to the case, and had some space remaining to fit a hard disk to add some gigabytes.
Here are some images of the "GTA-PC":
If you have 5 minutes, be sure to read the full article (including other images) at Mini-ITX!