Luxa2 bills its new Zirka Case for iPad + iPad 2 ($40) as the thinnest sleeve available for Apple's tablet computers. Rather than the traditional materials we're used to -- leather, neoprene, and the like -- the company chose to use a very grippy polyurethane material that feels somewhat like the bottom of a sneaker for the body. The inside is lined with micro fleece, and the iPad slips in under a Velcro-laden flap. Zirka also transforms into a stand…
