I don't know if the world needs another chess program, but here is one :-)
It is a C-extension for python, and includes a cgi based chess application:
The chess engine itself, is one I wrote a long time ago, and now I have updated it (for ANSI C) and created a python wrapper for it.
I am planning a few more releases - adding features to the python interface. I have previously written GUIs for it, but they don't seem to last very long before becomming obsolete. I'm not going to do another - in addition to the CGI game, but may try to interface it to an existing one.
If you are aware of a good candidate - particularly if it has a python interface and is relatively platform independent, I am interested.