I've made a little concertina book and I love it - am still working on the pages and will continue doodling in it.
It's made from Readers Digest magazine pages and the cover measures 75mm x 30mm or 3" by 1.5" for my metrically challenged friends ;-)
2011 tip eight: the number of brushes you own doesn't make you a painter... I just bumped over two containers with a zillion brushes into an unreachable corner of the studio... bummer! :-)