Until it died a couple of years ago I had an IBM Thinkpad x41 tablet PC for several years. I loved that thing and switched between tablet and laptop mode all the time when using it. I now have an 11" Macbook Air, and while in many ways it is the best laptop I've ever owned, I sorely miss not being able to swivel the screen around and turn it into a tablet. My next laptop is definitely going to be some variation on the theme tablet/laptop hybrid.