I recently purchased a new MacBook Air for myself and one for my wife. I setup my MBA downloading 4 or 5 apps from the Mac App Store as well as iLife updates. I then started to setup my wife's MBA similarly. I found that Mac App Store apps/updates downloaded MUCH MUCH faster. I was getting up to 4-6 MB/second which is MUCH faster that I've ever download ANYTHING before. Normally I don't get much over 1MB/second even from Apple. I've never had download speeds anywhere near that. It's as if the Airport Extreme or one of the other machines on my network has saved my downloads or something similar. I assume there is no storage on the Airport Extreme however (as distinct from the Time Machine hardware). How is that possible?