So, like, I installed DVArchive on my LAN so I can use my PC hard drives to store shows from my ReplayTV 5040, and it turns out that DVArchive stores 'em as fairly vanilla MPG files. Massage them a little with a tool like Mediacoder 0.5.1, and you can load 'em up on a Rockbox-enhanced Gigabeat and play them in color with sound.
I have the Halliwell sisters, Martha Jones, *and* both Jackie and Donna in my pocket! Proooot!!