I've heard hints about the free basic account at box.net.
Once signed up, I can use the Finder's Connect to Server command, specify
http://www.box.net/dav/ as the url,
username@domain.foo / password, and it's mounted.
When I specify
http://www.box.net/dav/ plus un/pw to OF Mac 102746 I get a 500 (internal server error) value.
This also happened when I tried my WebDAV-enabled 1and1.com account.
??