Less than three days since the MacBook Air's debut, companies are working furiously to come out with accessories that will most certainly deluge the market in coming months. So even though Belkin's sleeves and cases aren't exactly revolutionary, they score points for being so quick out of the floodgate. In fact, Belkin's already got a whole new line on its site, with options for color, leather, neoprene, straps, and fasteners, for $40 or $50. It's unclear when they'll be ready for delivery, however. So if you want some faster--and cheaper--you can always opt for "AirMail."