I'm running WinXP on a MBP and waiting for solid build of Parallels that will play nicely with Leopard. I've been waiting to upgrade because I can't afford down time ... literally none except for the time to upgrade to Leopard. So should I do it, or wait? I've had Leopard sitting on my desk now for a couple of weeks. I know VMWARE ran into some issues, but it appears that Fusion is playing nice with Leopard.