Apparently these small books, like a cross between a hardback and a diary, have been around for over a year:
Michael Kohlhaas
When I saw them in Munich yesterday I was tempted by the thought of reading Kleist and Stifter. They are only 7 euros each. But of course, I could get these any time through the German version of Project Gutenberg, Projekt Gutenberg, and even put them on my PDA. If I found time to read them.