Of course, as well as trying to guess the future I am just as dangerously trusting that my old faithfuls (2006 mini mac and 2007 iMac) will continue to flawlessly provide optical drives, archive storage, scanner and some other things via Tiger, vm/windows via SL, while the Air with ML gives me access to things they can't, such as iBook author, Pages, and the things that will sync with iPad. So, the plan is, the Air will be a bridge from my old dinosaurs to some magnificent retina beast that will do all the Air and iPad don't, or don't completely, such as music and art apps on the iPad. I've had lots of macs since my first Classic, and I've never been as uncertain as I am now about upgrading. Hmmmmm.