That looks very nifty! Any chance of adding dundun notation too? The djembe parts for most rhythms are not that interesting, seeing that there is something like 80%+ replication. It's the dunduns that make or break it, as far as I am concerned.
Your web page doesn't explicitly say but, seeing the forwarding icon on one of the screen shots, I take it that it is possible to email the notation as a PDF or some such? If so, great; if not, that's something I would add because, if the notation is trapped in my iPhone, it's no good to anyone but myself.