2nd grade bloggers?

Two 2nd grade teachers approached me today about working with some of their kids.  The first teacher who came didn't have a plan or any ideas for me, but I immediately suggested a book club.  I hope the parents of those young 'uns won't mind them blogging!  When we start this next week, I'm going to have them blog - probably by posting projects or audio files (such as a Blabberize, fotobabble, voicethread...) some web 2.0 tool, not just text.  I need book suggestions now...