audiobook app?

Hello, my collection of audiobooks that I have been collecting over several months has become extremely unwieldy. I almost exclusively use librivox.org to subscribe to the books through itunes where I then put them on my touch. I have so many now that they are becoming hard to manage and very unorganized, I would also like something more feature rich like the kindle app with bookmarking and such. Anybody have the same problem? Is there any app that will work and still allow me to use librivox as my book source? Thanks