If you like to read then you should check-out http://www.wowio.com
You sign-up for an account and can download lots of books for free, the catch is that there’s an ad page in the first few pages of the PDF book, but that’s easy to page by. All kinds of subjects and different authors.
And if that’s not enough for you and you live in Hawaii (and have a Hawaii State Public Library System card) you can download eBooks for free too from http://hawaii.lib.overdrive.com/ but they have due dates where the books expire after a set amount of time. They have audiobooks too but iPods and Macs are not supported.