If you send a lot of emails and texts from your iPhone 4 or iPhone 3GS, do you find yourself wishing you had a real keyboard instead of just a virtual one? ThinkGeek will be offering a case with a built-in Bluetooth keyboard for your iPhone 4 or iPhone 3GS. The keyboard has its own rechargeable battery, so you don’t have to worry about draining your iPhone’s battery. The TK-421 keyboard works with any app such as e-mail, web browsing, notes, and calendar. The TK-421 case is an exclusive ThinkGeek-designed product and is being made in limited quantities. It will be shipping in November. Sign up at ThinkGeek to be notified when they are ready for shipment. The TK-421 iPhone Case with Flip-Out Bluetooth Keyboard will be $49.99.