XtreemFS - file systems for the masses - a replicated and distributed file system for the internet and cloud storage
http://www.xtreemfs.org/
PyFilesystem 0.3 released
http://www.willmcgugan.com/blog/tech/2010/6/20/pyfilesystem-03-released/

Not sure this is worth another library

A Python module that provides a common interface to many kinds of filesystem.

Sweet, just what I needed: PyFilesystem 0.3 released - http://j.mp/93572S