I’ve been using the Macbook Air for a couple of months now.  I decided to convert my Macbook Pro into a Windows Vista machine.  I’ve been having wireless problems in Mac OS X, but for some reason I don’t have the same problems when running Vista on that machine.  I use that machine for testing websites and running Windows only applications.  For the most part the Macbook Air is plenty of machine for what I need to do and I figure in times where it can’t I can pack the Macbook Pro and the Macbook Air into my bag when I travel and still keep my bag under 10 pounds.