Updating wordpress via svn is the hip thing to do these days (because it's about a million times easier than the usual way.) However, the guides I've seen so far all tell users to use wordpress trunk, and that's just stupid!
$ svn switch http://svn.automattic.com/wordpress/tags/2.0.7
is far longer than
$ svn up
so convincing users to do that would be difficult. What I would suggest is a "stable" svn tag - or you could call it "release" or whatever, but basically after implementing that, we can contact the authors of guides on using SVN to update Wordpress and encourage them to change to using the stable tag.