Laptop: WIndows 7 Ultimate w/ Ubuntu, Fedora via VMWare Workstation
OQO: Windows XP SP3
Desktop 1: Windows Vista Business 64-bit
Desktop 2: Ubuntu 9.10
Desktop 3: Mac OS X 10.6 w/ Haiku, ChromeOS Zero & Ubuntu via VMWare Fusion
Server 1: Windows 2008 Server w/ NetBSD dual-boot
Server 2: Mac OS X 10.6 Server w/ Windows 2003 Server, Ubuntu, Haiku via VMWare Fusion

And yeah... all of those are at my home.