I run an ESXi 5.5 lab with Server 2012 R2 with MediaPortal TV server (2 DVB-S/S2 cards), server 2012 with exchange 2013 and a windows 7 test VM for mediaportal testing of new releases, code and other in progress updates to the TV software.
The Server 2012 R2 effectively is my AD, cloud backup, JBOD storage (LSI megaraid card), tv server to the rest of the house for Sky TV And FTA.
I'm eventually going to virtualise all my HTPCs in to one machine and feed from a central place to each room via an HDMI cable... And then I might have a go with the normal PCs too, virtualise them for gaming so I only have two hdmi sockets per room and a couple of USB ports for mouse/keyboard.