Maybe a bit late for saying "Hi, glad to join!" since I have already sent another message, but yesterday was a long day at work.
I also knew about notmuch from the LWN article back in December and have been following it through the "git update" and the mail archive since then (though not reading all messages neither all the code). I am also very glad of something like this having been created and look forward to help enhance it and use it more extensively (right now I am trying to get the Gnus bit in place). Regards, Servilio