I've just created a SVN branch for setuptools 0.6 beta and beyond, which can now be accessed with 'setuptools=dev06'. 'setuptools==dev' now refers to the 0.7 development trunk.
I had to do this now because there's a fair amount of surgery I need to do to make setuptools merge with the Python 2.5 standard library, including module moves, renames, etc. So, to not lose all the hard-won stability of 0.6 as it is, I've split things up.
Naturally, I hope that 0.7 will be just as stable as 0.6; it's more of a "have something always ready to release" issue. There's going to be some fairly intense reshufflings of the source code, though, including a switch from reStructuredText to PythonDoc LaTeX for the documentation, due to the need for integration with the Python documentation system. The C source code for the launcher will get moved, etc. There is also going to be some code migrated from pkg_resources to the stdlib's "pkgutil" module - specifically, the importer-specific infrastructure for filesystem and zipfile packages, as it's already been duplicated two other places in the stdlib. So the plan is to consolidate the various versions of this into pkgutil. setuptools 0.7 will include a replacement version of pkgutil for use by version of Python <2.5, but the setuptools bundled with Python 2.5 will just use the stdlib pkgutil.
I don't plan to make any API changes to pkg_resources, however. It's only some of the implementation that's moving. It's also likely that Python 2.5 and up will use 'python -m easy_install' as the default way to invoke easy_install, but the older versions will retain their separate easy_install executable.
I'll keep you posted here if there are any changes to the above. Please keep in mind that if you are currently relying on 'setuptools==dev' being relatively stable, you should consider whether you want to start using 'setuptools==dev06' instead, at least until an actual 0.7a1 release is available.
In the meantime, I'm assuming that all is going well with 0.6a11, and that it can reasonably be bumped to 0.6b1 sometime next month. Please let me know if there are any issues outstanding with the 0.6 versions. Thanks.