Forum OpenACS Q&A: Re: oacs-dav with MacOS Snow Leopard
tdav looks in general architecturally nice, with the only complaint that it could be done much more flexible object orientation in mind (subclassing e.g. of e.g. a general storage property manager etc.).
However, concerning Mac OS X, using this version of tdav would not solve the problem of the poster, since the Finder of Mac OS X (WebDAVFS) uses chunked encoding for PUT requests, which is not supported from aolserver/naviserver.