I just ordered a new iMac and Parrallels 3.0. I am a Mac guy and reguarlly curse Redmond Washington. The only reason I need a PC is because I create powerpoints used by schools that are only have PCs. When I create in them in Mac Office and convert them to MS Office PC, I run into many problems and extra work. So I purchased Parallels. I will be using Windows just for this, but I will be using Mac applications at the same time. I will be using only Leopard for everything else. What Windows system do you recommend with Parallels, XP or Vista. I would like to minimize my installation and usage headaches.