Although pretty similar in appearance to its Crystal Cover Set already on the market, Simplism's Crystal Gaban Set for iPad 2 ($35) has some major functional differences. It's a crystal shell with good coverage around at the bottom and sides, offset by an overexposed top. What's unique are the loops at each of the four corners: these connect to the included strap and allow the iPad 2 to be carried like a purse, or used hands free. Simplism also includes…