That's a hard one. I'm a book worm. Hmmh... I don't think I have one favorite. I have several favorites - The Magdalene Line by Kathleen McGowan, the Dark series by Christine Feehan, the Fever series by Karen Marie Moning and some others I can't think of. I tried reading the Harry Potter series, but I couldn't get into it. I don't know why since I loveeeee the movies. I even had the collection in a nice box-wrappy-thingy. But I ended up giving it away during a move.
I agree about the Harry potter series. I also REALLY like the hunger games series although it wasnt as good as the potter series, and the inevitable love triangle thats always included when a female is the main character really bugged me. (side note: why is it men are the dogs and cheaters but EVERY novel with a female lead WRITTEN by women has a love triangle?) I unfortunately read twilight. What a horrible set of books. I cant believe they made so much money off of the movies. Its all poorly written and horribly acted.