What Am I Reading for My 2010 New/Old Reading Challenge?

Well, now that I've finished The Last Enchantment by Mary Stewart, I realize that instead of re-reading an "old favorite", I ended up reading (for me) a whole new book! I'm guessing I must have read the first couple of chapters many, many years ago, but for some reason, then put the book down and never finished it. So much of it was "new" to me that I'm counting it as a "new read" instead of an old one for my reading challenge.

Therefore, it's time to choose a book I really do know I've read b...