A little implementation of WebDAV would allow mounting directly repositories, like with (FUSE webdav client).

I've always seen this feature in svn repositories served through http or https, and it allows easy browsing of a project by simply mounting its upstream repository as a network filesystem.

wdfs even has a <tt>svn_mode</tt> that puts into the filesystem a subdirectory where all versions go, to be able to have in the filesystem tree multiple revision of the concerning svn subdirectory mounted.