WebDav lets you treat a web server as a real writable file server. 

Lots of popular tools have built-in support for DAV including Windows XP, Office, Macromedia tools, Adobe tools, etc. 

Apache are producing SLIDE, a DAV content management system. Then there's [SubVersion] a DAV based wanna-be replacement for CVS. 

See [http://www.webdav.org/] 


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If you like WebDAV, check out the BarracudaDrive home server with integrated WebDAV server.
http://barracudaserver.com/products/BarracudaDrive/

A really easy to use and cool WebDAV client is Total Commander: http://www.ghisler.com/

--AnonymousCoward, 15-Oct-2007