Vijayshinva Karnure wrote a very cool article about running Server 2008 as a desktop os or rather as a Windows Vista replacement. It seems that besides additional features like Hyper-V, Server 2008 runs approx. 20% faster than Vista.

If only upgrading Vista to Server 2008 would be possible… (has anyone ever tried)?

Links:

http://blogs.msdn.com/vijaysk/archive/2008/02/11/using-windows-server-2008-as-a-super-desktop-os.aspx

http://vista.blorge.com/2008/03/11/windows-server-2008-is-20-faster-than-vista/