The other day my daughter demonstrated a milestone of the serious book reader: the need to flag a particular passage so that she can find it again. We are a little more than halfway through Harry Potter and the Order of the Phoenix (we usually only read it for 20 minutes a day during breakfast). We came to the scene in which Cho wanted Harry to ask her on their first date, to Hogsmeade for Valentine's Day. Cho's goal was obvious to my daughter, at just eight. Harry, however, was totally clueless.
My daughter found this scene HILARIOUS. She immediately grabbed for a post-it flag, scribbled "down" on it, and placed it at the top of the passage. Then when a line near the end of the scene was especially funny, she added a second marker there.
She has, of course, seen me sprinkle books liberally with post-it flags for years. She has started encountering my old markers as she reads books on her own (the first Harry Potter book, e.g.), and she'll sometimes ask me why I flagged something. But this is the first time I can remember her excitedly marking a scene on her own.
She probably has a future as a book reviewer, should she choose to accept it. [Shades of Charlotte's son, who has grown up with the Cybils in his household, and eventually became a judge, too.] Do other people's children use post-it flags to mark passages?