I need to pick up a notebook this week (so please don't suggest waiting I need one for a conference next Tuesday) so I am trying to decide between the Macbook Air and Macbook Pro 13". It won't be my main machine and will really only be used for travel and conferences... meaning taking notes, using keynote, and using XCode. So really my main question is if you can sit the air on your lap during a presentation for taking notes, blogging, etc? Or would it get too hot? Would it be much different (or any different at all) from using a 13" MBP for this?