Here’s a link to a very spirited exchange on different versioning tools and methodologies:

http://ask.slashdot.org/article.pl?sid=06/06/05/1922209&threshold=-1

Here’s an intriguing excerpt that talks about SVN and WebDAV:

SVN + WebDAV + Autoversioning
(Score:5, Informative)
by HFShadow (530449) on Monday June 05, @06:20PM (#15475989)
http://svnbook.red-bean.com/nightly/en/svn.webdav. autoversioning.html [red-bean.com]

From the SVN Handbook:
“Because so many operating systems already have integrated WebDAV clients, the use case for this feature borders on fantastical: imagine an office of ordinary users running Microsoft Windows or Mac OS. Each user “mounts” the Subversion repository, which appears to be an ordinary network folder. They use the shared folder as they always do: open files, edit them, save them. Meanwhile, the server is automatically versioning everything. Any administrator (or knowledgeable user) can still use a Subversion client to search history and retrieve older versions of data.”

And here’s the link to the SVN handbook this came from:

http://svnbook.red-bean.com/nightly/en/svn.webdav.autoversioning.html

Worth a look and perhaps a followup discussion.