Hi,
I'm using an ARCHOS 5 (250GB) with the optional mini dock. It has an USB host so I'm able to connect the cam with the cams USB cabel.
Fine thing is: It's able to show dng images (not tried pef so far now
update: I testet K200d and K20d PEFs and it works).
It don't need a power supply.
A very good display also : 4.8'' TFT LC-Display, 800 x 480 Pixel
And: it plays various multimedia formats with the codec plugins.
ARCHOS
Greetings,
Matze