there are downloadable games & activities for kids. you can also print out your own flat stanley for vacations or mail him out around the globe, which he's kinda used to by now (he's been around since '64). there's also more. so, feel free to check it out.
of course, since it is flat stanley, there has to be a picture gallery so readers can post their stanley pics.
* i just found this while writing this post. how often does a book illustrator see their own characters made into a video game? yay.