Howtoforge posted a guide about setting up WebDAV with Apache2 on CentOS 5.5

This guide explains how to set up WebDAV with Apache2 on a CentOS 5.5 server. WebDAV stands for Web-based Distributed Authoring and Versioning and is a set of extensions to the HTTP protocol that allow users to directly edit files on the Apache server so that they do not need to be downloaded/uploaded via FTP. Of course, WebDAV can also be used to upload and download files.

  How To Set Up WebDAV With Apache2 On CentOS 5.5