Dock extension cable?

Does anyone make an extension cable for the dock connector?

It would really rock if someone did because I'd be able to connect it to my G5 iPod to my Luna clock radio without removing it from the case. It's a bit of a deal to get the iPod out of the case and I worry about scratching the screen, each time I do it. I know eventually, putting it in and taking it out will definitely leave scratches.

Anyone?
Bump. I need the same thing to use my Griffin iTrip with my iPod Touch in its case.