Sold in separate versions for the iPhone 4 and iPhone 3G/3GS, ThinkGeek's new TK-421 ($XX) is the exact accessory many iPhone users have been waiting for since Apple rolled out the first model in 2007: a flip-out keyboard with usable, chiclet-sized keys, mixed with a case. The top hard plastic shell is a slider-style design that lets you insert the iPhone through its bottom, locking a piece in place with Dock Connector, speaker, and microphone…
