Hope you don't mind if I hijack the thread a bit. I'm curious what your business model is, how does Kill Bill make money?

Do you offer paid support and hosting?

I'm asking because I'm a big fan and proponent of OSS, but I often struggle to see or understand the business models for OSS companies.

I'm wondering the same and obviously can't answer for them, but it looks like killbill is a two person side project. If they intend to monetize it, I'm sure they could do so by offering a hosted version of the library.

Yeehaw! That's exactly what I'm looking for. I think I stumbled upon Killbill over the summer but it wasn't quite where it is today. I'll definitely be taking a hard look at this.