I read somewhere that there will be an "Extraordinary Adventures of Alfred Kropp" movie coming out in 2009!
Now, I heard that the movie rights have been sold. This information came straight from the official website. So, I'm pretty sure it's true information.
Also, there is a third book coming out. It's called "Alfred Kropp and the Thirteenth Skull". I haven't found the release date yet but I am definitely going to keep an eye (and ear) open for it. I will be posting a link to the official site so you can check it out yourself. But, trust me it's there!
Here is the cover of "The Thirteenth Skull"