May I suggest podiobooks.com all of their books are free. They ask that if you liked a book you make a small donation - over 50% of which goes to the author. They have a good selection. I would Reccomend How To Succeed in Evil Volume One by Patrick McLean. This is an awesome little book, I enjoy each new chapter thoroughly when it comes out. Very funny and reminds me of my super hero larps quite a bit.

iTunes also has tons and tons of free podcasts to download - i have more of them than music.