Cases (shells) for the 13inch MBA

Hey Guys (and hopefully) Gals, Just got me new Macbook Air 13inch. So far I love OSx. It's actually my first time owning a Mac. It's like night and day compared to Windows as far as usability especially with all the gestures. I'm looking for a Case/Cover/Shell? . . . That I can just put on and keep on the Air. First off to protect it and secondly having the all Aluminum casing does make the machine rather slippery when on lap especially when laying down. Any Suggestions for good ones you've tried?