That is a great site!
I also download from iTunes as well. If you search under audiobooks then look in the podcast section they are all there.
(I'm pretty sure they are all on librivox as well, but might be a different reader that you prefer)
Audiobooks with Annie podcast is also good, she is reading Anne of Green Gables right now, but has not been on for some time. (I believe she is ill)
You could also learn a language
They have some really good free language learning podcasts.
(Can you tell I'm addicted?!)