It's one of two silicone rubber cases from Incase for the iPad, and as close to bragging as we've seen yet from a case maker: the Protective Cover for iPad ($40) comes in four colors, covering everything except for the device's large glass screen, ports, screen orientation switch, speakers, and microphone with thick, soft rubber. The shock: Incase's molding is so precise to the actual iPad that the tiny microphone hole on the device's top has a perfectly…