Each month we here at Guru3D.com we choose a rig of the month.
September 2008 are 'Flatline & Coma PCs' from 'Flatline aka Dave. Pretty normal PCs (for Guru3D standards) nice pimping jobs on them. But obviously the semi-control room he created is pretty interesting to see by any standard.
http://www.guru3d.com/category/rigs/