You mentioned audiobooks, fryandlaurie. I've gotten a few from
Audible, and been relatively pleased with them (I mostly use audobooks for plane flights, and I don't fly much these days
).
Anyway, I thought I'd mention them (in case you don't already know of them) because they have a pretty good selection of unabridged stuff. 'Course it costs out the wazoo, but there you go.
Their files play well on a number of platforms including the later model Palms (last 5 years or so), and iPods, so they might be a good option for you there.