A friend wrote about my tool on his email list and I got 50 new users in one day (and counting).
Amazingly, I've had 0 bug reports today and only one question that was more a "how can you do this" than a "help! something isn't working."
I've also been booked to talk about this on a podcast and have an established website company wanting to pay me to make an integration. Not bad for a week in :)