I run Windows Server 2008 as my desktop operating system at home.
Simple really :)
It’s more responsive than Vista, it handles my development better, and it natively runs Hyper-V.
And it means I can work as if I were in the office with multiple machines easily.
I know I can do all this under Vista, with a few tweaks, but I truly do find Server nicer.
The only snag is that some software doesn’t install properly – although it works fine once installed. One of these apps is the Microsoft Zune application. However, here is a good work around to get it to install: http://blogs.msdn.com/dzazzo/archive/2008/09/16/installing-zune-3-0-on-windows-server-2008.aspx