Ok, my MBA will be coming in the next few hours, and in preparation, I have been searching (for a couple days) for websites or posts about modding the MBA. The most ambitions mod would be to get a used bottom cover, reshape the battery area (cave it in) and make the battery external somehow. Then you could get one of those replacement batteries off ebay to use as a second battery to have for "emergencies". Of course adding internal GPS on one of those unused USB connections, or an internal SD reader or just modding the case with an additional USB port and connecting it up would be nice too. But I am amazed there does not seem to be much modding going on with the air (now I know you apple folks will be quick to say "because it is not a PC and is already almost perfect, we don't need to mod") But really, it seems this thing is just ripe to mod (not that I am planning on bricking my MBA anytime soon to try some of these wild ideas I have).