Stage each project to a separate top-level directory named after the release tag (you're of course tagging your revisions; or at best name it after the revision it corresponds to). Use svn export if you're really paranoid to completely break any ties back into a repository from live code. Symlink the "real" path to that project back to the current version. That way you can easily switch between versions by repointing symlinks, plus with judicious environment twiddling (see Envy from CPAN; it's a bit long in the tooth but works fairly well once you get it configured to your liking) you can point to a specific release if need be while not affecting the "default" version.

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