In January, I wrote a review of the Sleeve360 "wearable" iPad case that had just hit the market at that time. I saw the Sleeve360 team at Macworld Expo a few weeks later, and was happy to see that they were selling a pile of the cases. In April, I gave away a HandStand iPad case that was similarly endowed with a hand-gripping, rotating mount on the back. Now that the two cases have been brought up to date in the iPad 2 era, join me in a smackdown