Wait...so the bottom of the superdrive is black? Completely black? Then, um...I'm wondering where the confusion has come from. :S
Um...I could understand not knowing which way is up if all the sides were one color and they all looked the same, but I'm with mfoster on this one, sorry--I wouldn't put the black side with all the technical stuff and the rubber "foot" on top. I don't understand how this confusion could've happened, especially if you have to plug it into the MBA and the USB has to be face up too, as Mfoster said.
Maybe, if you don't want to get the top confused and show that you're an Apple loyalist, you can take one of the spiffy Apple stickers that came with your MBA or iPod or other Apple device and stick it to the top? Maybe it's because I walk the line and I use both Macs and PC's, but I've never actually understood what to do with those Apple stickers I've gotten with iPods in the past, so...maybe this is where one of them would come in handy?