Google Books (Beta) has lots of digitised books & mags online for free viewing.
Lots of classic books like: War of the worlds, Wizard of Oz & Peter Pan etc
and also magazine back issues like: Mens (& Womens) Health, Popular Science, Running Times, Maximum PC & the ever popular Log Home Living?!!!!
Some books are only partial previews however but Google is working towards putting full out of print editions online.