I've got a triple-boot AROS native, Haiku rc3, and Fedora Linux machine. It doesn't see much use.
I've got a PowerMac G4 with MorphOS 2.7 unregistered. The network card I bought for it doesn't work with MorphOS and the internal Ethernet adapter doesn't work with MorphOS either. Therefore it remains unused.
I've got a Mac Mini with a Core 2 Duo that is my primary use system. I access AROS Native and Xubuntu Linux under VirtualBox on it under MacOSX Snow Leopard.
I've also got a Windows Vista laptop that's been cross-graded to WinXP. Some of the Vista drivers don't work under XP but I'm beginning to take on a liking for C#.net 3.5 and WinForms. I wish there were some reasonable equivalent on the Amiga.
I wish I had the space to set up my Amiga 1200 but since most of the software on it is freeware, I can make do with EUAE on my Mac.