my DD7 is re-reading the second Harry Potter and also reading Dragon Wing - which is an adult fantasy novel. She likes my husband to read with her at night and it didn't take him long to balk at 'boring' books. They read the whole Harry Potter series together then dabbled in a few other books. Now he decided she can read some of his books, so that's what they are working on now. I am a little apprehensive about it, because I haven't read it myself, but DH has and he thinks it's fine. I caught her awake reading it at 3:30am a couple nights ago, so I guess she is enjoying it!
I also recommend Alex and the Ironic Gentleman - DD devoured that one and I found myself enjoying it too when she read out loud to me. I am going to try to get her to move on to the Percy Jackson series though, and that Science Alliance one.