Remember you can use Boot camp or Parallels for using yoiur curent applaicatiosn until you need to replace.

Mac laptops are haevy and hot, the Air is light but not reccomended.

In fact the only blip on the Mac horizon is taht the computers are not selling. The buisness is being driven by the iphone and ipod,in some ways the main business is back where it was pre-ipod