I've been using the OpenSUSE KDE instead of Gnome and its really cool. Its amazing how much I like this version of Linux. Its worth having it just for Amarok music player alone. Amarok is the most powerful and versatile music app I've ever used. I downloaded all the codecs from the community repository and it plays everything imaginable, even Windows wma.
I have set up a dual boot XP/SUSE configuration, but I haven't tried an OpenSUSE/Vista one yet. I'm sure its the same principal and will work, but you know how computers are. Don't assume anything will work until you actually try it. The OpenSUSE and Vista mania continues.