If you want to use the webdav funtionality with other webserver configurations than apache mit mod_php you have may be the problem that you don't have the php server var

$_SERVER['SCRIPT_URL']

To fix this, replace all usage of this variable with

$scriptURL = $_SERVER["REQUEST_URI"] . '/';

This works very well for lighttpd 1.4 + fcgi php 5.2
Tested webdav clients: konqueror, gnome webdavclient, ie6

with ie6 i had a small problem to access for example the url media/images to display all pictures under this folder. Because the webdavserver looks after 'media' as a virtual folder, but the virtualfolder array has only array('Media','Content') and didn't match because of the difference of the first characterer.
I don't understand this, that only the ie does this. Maybe the webdavclient do something different e.g. caching - requesting.

For me i change the virtual Folder name to lowercase:

static function virtualContentFolderName()
    {
        return ezi18n( 'kernel/content', "content" );
    }

    static function virtualMediaFolderName()
    {
        return ezi18n( 'kernel/content', "media" );
    }

That works for me in all tested webdavclients.