Similar to both Simplism's Smart Back Cover and SwitchEasy's CoverBuddy is BackBone for iPad 2 from iFrogz ($35). A Smart Cover-compatible shell, BackBone snaps on to the tablet, covering the back and edges. As is thankfully becoming more common, the case extends all the way to the top, bottom, and right edges. A half-inch wide, eight-inch long portion of the left is open for the Smart Cover to attach. All of the holes for access to the ports and…