I've been hooked on Orson Scott Card for a while now. I've read Ender's Game, Speaker for the Dead, Xenocide, Children of the Mind, Ender in Exile, and Hidden Empire all in the past few months. I'm currently reading Ender's Shadow and will read Empire next.
I don't usually read this much of one author all at once, but since the books were written over a few decades, Card's writing style and focus changes a bit from book to book. Its nice because in the Ender series, his characters grow and age (much like the author in a way) and it works really well with the story.