Whilst jailbreaking my touch, I had a peek around the captured ROM image and it looks as if all the support software for Bluetooth is on the ROM (/Library/Frameworks/BluetoothManager.Framework, /Library/PreferenceBundles/BluetoothSettings.bundle, /etc/bluetool directory, /usr/BlueTool). It could just be that Apple have a common ROM for both the iPhone and iPod, but it could also be that there's something hidden in the iPod...