I didn't get my iphone 2.0 update to activate yet, but am using 01.com for Zimbra hosting, and they have a couple of useful links for iphone 2.0 and webdav:
https://admin.01.com/help/index.php?...=284&nav=0,47#
https://admin.01.com/help/index.php?...articleid=278#
-- the latter describes how to connect to your WebDAV folders from Finder. I could create new folders after that, and suspect it'll work for OF, too, -- any 01.com users care to confirm?