I just bought my first Mac, a 13" Air and there is a small problem with the keyboard which is not serious but bugging me. The left command key has a shadow in the middle (the "mm" in command). It looks like the key has been heavily used. It could be a problem with the backlight under that key or with the key itself. I took the laptop back to the Apple store and we found the same problem with the display model. So is this the same for all the new 13" Airs or does my local store (in Thailand) have a bad batch? Thanks.