We use my old 80 gig Ipod video, the first Ipod video that came out with the metal back. Not for video as much as music. 80Gig is a ton of music!
We've had that little guy since about 2006. Since then, he's been to 4 burns and probably 6 or 7 other camping trips. We don't really do jack shit to protect it besides blow in the charge port, like an old NES cartridge.
I also have one of the old ipod docking station boom boxes, its not doing so hot any more. It never really recovered from the morning I crawled out of my tent to see the boom box with Ipod in it, laying next to the rocks around the fire, covered in booze, dirt, grass, and nature- still playing music. The right speaker doesn't work unless you smack it just right.
This is the ipod boombox I use. I wish I could buy another one but I don't think they make them any more.