I am a proud owner of an Air, as it has met all of my expectations over the last few months of ownership. However, I just booted up Google Sketchup to do some 3D modeling and was sorely disappointed. After a few minutes, it becomes nearly impossible to do anything as even the simplest command such as Move, makes the little color spinning wheel appear and things are delayed. I checked the fan speed, and it was running normal (~2700 rpm), so I don't think the processors were overheating. However, I tried restarting both the program and my MBA, as well as trying to model simple shapes and still had the same results. I was wondering if anyone else has experienced these issues, or if others would be willing to try it out on their MBA to see if they get similar results. You can download the program for free here. This is very frustrating as I used to run Sketchup on my old iBook G4 without any problems!