Engadget: We've been eagerly waiting for iPhone cases with built-in keyboards to hit ever since iOS 4 added Bluetooth support, but they simply haven't materialized like we'd hoped -- in fact, ThinkGeek's TK-421 case is the first to hit the market, nearly eight months after iOS 4 was first announced. Now that it's finally here, we've got to ask -- is this thing the ultimate iPhone accessory? Does the iPhone actually need a keyboard? Does flipping open automatically make something awesome?
