Poro Pora Pora itibaren Anatoliko 240 16, Yunanistan
While I do wish that some of the characters were a bit more fully realized, this is a fantastic read. It's action-packed, has ridiculous puns (so sue me, I like 'em), and a story that doesn't follow the conventional YA fantasy pattern. Even better, the hero is a girl, something not done often enough in this genre (though Philip Pullman springs to mind as another great example).
A sci-fi classic. Another Top 10 Favorite.