While I've yet to see them announce one for the photo iPod, Belkin makes such for the current models.
And while not a great MP3 player (limited battery time of 2 hours or more), my X-Drive-Pro VP3 (Vosonic?) is what I use on travel to empty my camera's memory cards.
Is there a way you can transfer photos from a digital camera to an iPod or similar MP3 player directly (ie. without a computer)?