What Are Your Fave Free eBooks?

I just got an iPad and recently stumbled upon the free book section on Apple's bookstore--there are a ton of neat books there that are just being given away! I've downloaded a few and some are better than others, although a new one called Miyu's Wish and another called UnEnchanted were a lot of fun. Of course, fantasy is my genre of choice, but I'll read anything!

Does anyone have their own favorite free books? What are the best picks? (They don't all have to be Apple books.) I definitely suggest the two I mentioned!