Does anyone want to volunteer for hosting it?

Why would it need to be a reciprocal cipher? From what I understand, you go to the website and type it to encode. You click a link to decode.

There's a significant advantage to it not being reciprocal if it's encoding non-standard characters. If it's reciprocal, it would have to be based on a set of all printable characters. If not, you could do whatever crazy stuff you want, then add the escape() command so what you end up with is printable.