http://www.amazon.com/Merriam-Webst...mp;s=books&qid=1289273105&sr=1-1I picked up this one last year, because the bookstore didn't have the one I wanted (I can't remember what that was). I like it. It has beautiful photographs, and I recently discovered it has an appendix with 7 pages of flags of the world. (I love flags.) It doesn't have etymologies, but it does define it and tell you how to pronounce it.
My DS is 6, and this has worked well. As a caveat, he is not that into writing or spelling.
ETA: It does have a "look inside"
