The official repository for Ardour source code has now moved to git instead of svn. It is hosted at git.ardour.org. Users without write access can clone it using
git clone git://git.ardour.org/ardour/ardour.git. Users with write access have been privately notified of the changes.
We will likely clone the repo at github or a similar site, and keep it automatically up to date.
Do you have a policy regarding Github pull request submissions? For doing OSX work, should I just branch from master?
github pull requests will be handled via code review by myself or other ardour developers. master is the branch to begin all work from. all platforms, all goals … start from master. ardour-dev mailing list or IRC are vastly preferred for communication over web forums.