Here is my list,
3 Systems at my primary desk on a KVM, all XP Pro, best is a Quad Core 6600 - 4th system on the side desk, i7 920 with Windows 7. 2 22" monitors. (note that my primary keyboard is a $125.00 keyboard, and I still can't type) But that desoen't match a customer with 5 $800 3D mice. At $800 it seems strange to even call it a mouse.
All 4 systems have VMs installed, XP Mode and VMWare on the Windows 7 VirtualBox and Virtual PC on the other 3 running multiple copies of Windows 7 and Vista. NOT using Vista, just a demo VM.
Also in the house, 3 other computers, 2 are Lenovo Thinkpads.
With all the VMs it's like having 13 systems to keep track of.
HTC Tilt2 Smart Phone Jawbone Icon BT, HP mono laser, Xerox color laser,
Multiple GPS stand-alone and integrated into 2 vehicles. (not on a phone, yet).