On the traditional text front, the Spiderwick Chronicles and the Fablehaven series were ones that I tore through this summer. Really good books that are a perfect mix of action, mystery and fantasy for kids in the 9-13 year old range.
Fablehaven can get a bit intense in scenes, so maybe bump the recommendation up for that one to the 10+ range. It has a great female lead character, so is a good one for girls who like fantasy.
Right now I am reading book one of the Incarceron trilogy and am very intrigued by the premise. It falls into the distopian world category that has been popular in the teen age range since Hunger Games came out. This one is a bit on the older reader scale, I would say 13+ on this one.
Another big hit, not only in my classroom, but at home with my two sons is the Big Nate series. A bit more fun and a lot less sarcastic than Diary of a Wimpy Kid, Big Nate is just good clean comic fun.