I use a MacBook Pro as the main machine, with either a TV or pocket projector as external display. A wireless keyboard, mouse, or WiiMote is used to control the computer, and sometimes an iPad is used as an extended second monitor. In addition, a cat decided to join the "rig" by making herself at home on top of the warm MacBook whenever the screen lid is closed.

No photographs are available, but here are the hardware specifications:

MacBook Pro 13"
MacBookPro8,1
Intel i5 @ 2 x 2.3GHz
Integrated GPU HD3000 (not really designed for playing games)
8GB DDR3 RAM
Triple-boots OS X 10.8, OS X 10.9, Windows 7

External Display
40" screen @ 1080p

Projector
640 x 480 resolution, up to 120" display size
10 lumens

iPad Extended Display
2048 x 1536 resolution

WiiMote
Original first-gen Wii remote

Cat
Calico @ 3yrs
Female
3kg