I followed the roots of this with interest, back when it was called Bespin, then SkyWriter. The idea is compelling: most web developers just need a highlighting-capable text editor with online connectivity. Many of us work directly on staging servers, so in theory if there was a capable web-based editor around, you could work from pretty much any computer without having to install something. You could log into your web-based editor and all your bookmarks, SSH certs, everything would be there.<p>Now, Cloud9 is - from what I understand - the commercial version of this concept. Right now, signup seems to be broken, but I'm curious how it turned out.