I just read a winner of a book and passed it on to Ethan. I know it's a winner of a book because (gasp) Ethan’s reading it. The book is Diary of a Wimpy Kid by Jeff Kinney.
Rather than attempt a mediocre book-report-style review, I will direct you to Fuse #8 for Librarian Betsy Bird's professional opinion. (She's a professional librarian, and a professional reviewer.)
Basically, Wimpy Kid tells of middle-schooler Greg Haffley in a novel with pictures. The text is printed in a goofy handwriting font and every page has plenty of illustrations to crack you up or make a point. The pages are even lined to mimic a real diary.
I requested this book from the library when I read it just might be up for funniest book of the year and kept seeing it pop up on various children's lit blogs as one of the best books for middle grades. To top it off, Wimpy Kid is a total boy book and boy books don't come along very often.
So, if you know a 8-12 year old boy who is reluctant to pick up a book, throw Diary of a Wimpy Kid his way and leave him alone.
If you are still curious, check out the Diary of a Wimpy Kid blog. You can also check out this site for sample pages from the book.