Eragon, Pendragon, and Keys to the Kingdom (Err.. I think that's what it was called...) are some of my favorites. Pendragon is a ten book series, not finished yet, and most people would say it's childish... but, mai gawd, the most recent book (I think it's the eighth) is friggin' insane. It is just amazing... One of the most intense plot twists I have ever seen, messes with your mind. I can seriously NOT wait for the next book to come out.
EDIT! Holy gawds! I went to check, and... THE NINTH BOOK CAME OUT!1!!!!!1!CAPSLOCK1!
6 days ago!
Must.. get.. to store!