I am a Mac convert for the last 2 yrs. After being in the IBM camp for many years with a strong IT background, I was convinced to give it a try. I did use parallels at first, but have since moved to VMware Fusion which is far more stable than I think Parallels could ever be (that's just my experience - haven't tried Parallels 4 yet - and won't). I use VMware fusion with Vista ultimate (for non available mac or legacy type software) side by side and enjoy the best of both worlds. I would never buy another windows box.