I have a setup in which it would be stupendously convenient if I could put the mini on its side next to a thing that has about 3" of space left next to it. I have checked Apple's support site, and found nothing. Google in general turned up threads from 2005-2009 or so which linked to an Apple support article for those models, but the article link is now dead (it just goes to the new support page). Apple's support search form suggestions include multiple variants of "on its side" or "orientation", but do not link to any articles which are even a bit relevant.