I also set up a webdav server recently. here is a howto I found very useful. I hope it helps you out.
http://www.tldp.org/HOWTO/Apache-WebDAV-LDAP-HOWTO/you need to create apache users ( using htpasswd ) to access the webdav section.
Hoping it helps, Yann -- Yann Monclair --- email: yann@neodivx.org