Redwall series (by Brian Jacques) - It's been years since I've read any of these books (I was in middle school at the time), but I remember enjoying them immensely. There are 22 books in the series, all taking place in the same world, at various points in time. It's a fantasy series (knights & all that stuff), and all the characters are animals of some sort (mice, rats, rabbits, ect).
Inheritance Cycle (by Christopher Paolini) - I haven't read the final book (I really want to, though), but I love the first 3 books in the series!
The Bear & the Dragon (by Tom Clancy) - this is the only Tom Clancy novel I've read, but I really enjoyed it. Great military/espionage story.
He can never be Tolkien