I have WebDav installed and working actually...my problem is I am not sure where all the media is kept etc? I can see my siteaccess tpl but the images/files I am not sure about.
I'm not entirely sure about the location of the media as none of my current ezP sites use webdav anymore.
But according to the doc at [1] it looks like there is a separate media folder. Maybe the fine manual can help ya out on this one :)