What genre do you like? If you're into Sci-Fi, you can't go wrong checking out the Baen free library. Ebooks online for free. Even if you don't want to read ebooks (I love reading on my PDA) you can check out a few chapters and see if you like the author.
http://www.baen.com/library/

One recommendation I'll make right off the bat is "Dies the Fire" by S.M. Stirling. It follows the travails of several groups of people after a world changing event where suddenly electricity, gunpowder, or any sort of high energy device stop working. Basically life is forced back into the middle ages.
It's a great book (start of a series, in the fourth book now) and one group recreates the Scottish Clan system, right down to wearing kilts.