Can anybody who owns both an old 13" model MacBook Air and a new 2010 MacBook Air comment on the size/weight comparison between the two? Is the new MBA actually a smaller form factor and footprint or is it exactly the same? How does the weight compare between the two models? Is the new MacBook Air actually THAT much smaller and lighter than the old model? I am speaking about the 13" models only, not the 11.6". Thanks!