What are some recommended, Apple-Approved iPod dock adapter for the iPod Touch 2nd Gen?

I have a dock/CD player/radio for my iPod Nano, but I got a Touch 2G and gave my nano to my sister. Are there any adapters so that the dock will charge the Touch? Right now, the dock will play its music but the iPod says that the accessory is not for that touch. Thanks!

If not, what are some other good accessories for the iPod Touch 2G?

Thanks!