There is a configuration you have to modify in slide to make osx to work well. it's a known macosx bug (even apple knows it) and slide has a workaround, but you have to turn it on. search slide-dev for macosx or webdavfs.
I did and could at least *mount* the WebDAV folder, but couldn't write anything to it. This was using Slide 2.0beta1 and OSX 10.3.2, but I have to admit I haven't tried real hard.
Ugo
