I used to have a 12" PowerBook, but it died a few months ago. I currently own a white MacBook. Is the heat issue with the Rev A Air a real problem? The great thing about the 12" was that you could throw it in a relatively small bag and not worry too much about it. The MacBook is bit of a hassle, but not by much. Perhaps someday they can make a 12" MacBook once edge-to-edge screen technology is available to reduce the size of the bezel.