I currently own a late 2009 21.5" iMac and really love it. I was thinking about the future of the iMac and how the design can continue to evolve. Does anyone know how thin an optical drive can be made? I was looking at the profile of my iMac and wondered how thin the overall design can get... I was also wondering how and if we will ever see a radical departure from the current design, as we saw with the introduction of the iMac G4 when compared to the G3. The design has become so simple, I really don't see how they will abandon the "entire computer floats in mid air" design. Any thoughts?