I've been slowly attempting to decommission our work server closet without the luxury of downtime. Couple that with the fact that my job does not specialize in server administration, and there's a single user on a Mac, and my lack of formal expertise in network administration, and it becomes a much bigger project.
Today I was quite happy to decommission yet another physical server in favor of a virtual machine. That leaves me with 3 physical machines left to take down (1 is probably going to stick around for quite a while, unfortunately), and that means I've pared down the server closet enough to allow me to move the new hardware in.
The new hardware is quite cutting-edge, with the VM's running in Hyper-V. I've been quite happy these days with our development environment. We've got immediate building going on through TeamCity and NAnt, which allow true Continuous Integration. One of my employees has created the nightly deployment script, and I've just added in another more stable build that's also triggered through TeamCity.