Nice work, and I wish you success.<p>In the same space, I recently discovered <a href="http://c9.io" rel="nofollow">http://c9.io</a> , which I'm pretty happy with overall. Very rich feature-set, and it seems to be open source. (I say "seems" because I haven't checked to see if the OSS code is enough to replicate the site on my own hosting.) Although I've had some squirrelly save/load behaviour, which was concerning.
It seems like a cool service, are you charging enough though?<p>I made a site in a similar vein a few years ago but it never really caught on. Maybe we should chat.