My DS and DD love the Zita the Spacegirl series, the Warriors graphic novels (there are regular long novels, too; it's clans of cats), Amelia Rules, anything by Raina Telgemeier, Transformers GN series. There's a cool GN version of A Wrinkle in Time. Via recommendation on a Zita book review, we found a series that starts with "The Search for WondLa" that isn't GN but has cool art at each chapter start; great read-aloud fun.