After fits and starts in the iPhone and iPod touch stand markets, Joby finally has grabbed our attention with a brand new design. Unlike the company's past Gorillamobile products, Yogi for iPad ($50) combines a bona-fide iPad case -- one we'd actually use with the device -- with a detachable rear stand that can be placed either in horizontal or vertical orientation. The stand uses the company's signature ball joint design to provide two flexible arms…