I ran into the first problem related to the single USB port today - I needed to install software via the external drive (no other option for me at home) and have my HP C4280 printer plugged in at the same time. Get a USB hub and no problem, right? Wrong. My MBA external drive is a MIA external drive when plugged into the Belkin four port hub. My ethernet cable likes it fine, but the external drive only seems to work when it monopolizes the MBA USB port. Ideas?