No sooner had Steve Jobs announced his tiny treat during Macworld keynote did companies and designers put their noses to the grindstone to pop out cases for the forthcoming MacBook Air. How bummed would you be to get your new Air in a couple of weeks and not have anything to put it in? Of course, that thing's so teeny and my purses are so big, I'd have no trouble at all finding a spot for it, but I'd want my little Mac baby to be well protected. My favorite new case has to be the riff on Jobs' manila envelope bit — you can literally (ok, so it's not exactly literally) stuff your new MacBook Air in a manila envelope. See the slideshow for more brand spanking new MacBook Air cases.