My kids love these books. They're old, and probably forgotten by many, so I thought I'd remind you all that these are great books for kids Grade 2 and up. I'll even catch my sixth-grader whipping one of these out when she's low on time and wants something to read. (Okay, when she's going to the bathroom.)
It's Phyllis Reynolds Naylor Boy/Girl Battle series. Good for both boys and girls. I promise. And I don't mean to imply anything by the larger Boys Rock picture. It's how Amazon gave it to me, so blame Amazon (I certainly do because they just started charging sales tax in North Carolina as of February 1st!).