The library subscribes to an electronic book collection through NetLibrary. This is free to students faculty and staff you just have to login using your student ID with sc at the end (e.g. 0127456sc).
Also out there offering free e-books is WOWIO which includes classics, popular reading titles, some non-fiction, and a large collection of comic books (thanks to PopCandy for the info). WOWIO is free but you have to register and give them some personal information.
Check out both of these options for free online books!