I’ve been working on a side project with a friend for well over a year now, and in addition to the joy of working with someone you like on a problem of your choice, I’ve had quite a lot of “aha” (or “oh…”) moments.

We’re both basically happy with the state of our little project, with just a few small tweaks remaining before we can send it off into the world, except for one not-so-small thing: billing.