pure web based versioning system
I think it's actually a pretty good idea, but don't believe such a versioning system exists (yet) so hopefully you'll go ahead and make one.
I don't think adapting an existing solution is going to be easy, but it's probably worth looking into because if you use an existing solution you'll have all the client support done, and most of the versioning difficulties taken care of.
Starting from scratch is not going to be trivial.
-Adam
My hosting service does not currently run/allow svn, git, cvs on their server. I would really like to be able to 'sync' my current source on my development machine with my production server. 
I am looking for a pure php/python/ruby version control system (not just a client for a version control system) that does not require any services running on the server machine, something that could use the http interface to upload/download and sync files - basically offering a back end into my 'live' site for version control.
Additionally, I would think that such a system would be easy to develop an 'online' ide for, so that I could develop directly on the production server. (issues of testing aside of course)
Does anyone know if such a system exists?
==Edit==
Really, I want a wiki front end for a version control / development system - Basically look like a wiki and edit development files so that I could easily make and roll back changes via the web. I doubt this exists, but it would be easy to extend an existing php port of svn...