Let me start by saying I don't have one of these, but for those that do a lot of typing with their Vibrant this may be a good solution. $20.80 shipped seems like a bargain, if you need one.
It is a 49 key compact, rechargeable, wireless/bluetooth QWERTY keyboard for Android (et al) phones. DealExtreme: $20.80 49-Key Mini Rechargeable Bluetooth Wireless QWERTY Keyboard for Android/Windows/Symbian/iPhone
It is a 49 key compact, rechargeable, wireless/bluetooth QWERTY keyboard for Android (et al) phones. DealExtreme: $20.80 49-Key Mini Rechargeable Bluetooth Wireless QWERTY Keyboard for Android/Windows/Symbian/iPhone