I want to second the Belkin silicone case. Although it is for the 1G version, the 2G fits in it snug. There are no holes on the sides of the case for the volume control but that doesn't matter since it is silicone, you can still press the buttons through the case.
It will keep the back of the iPod from getting scratches until your invisible shields come in.
actually, that belkin case from best buy is for the 2G.
See: The Volume Control buttons on the side, 1G doesn't have that.