First, I think it would be very useful to know what's been updated. Secondly, I've been trying to find a reason to write some real Python 3.0 code. If such a resource existed, it would be easy to offer a bit of my time towards helping with porting efforts. I've written a few "test.py" scripts to learn new features, but nothing of any substance.
Does anyone know?
Update: As it's been pointed out (and I probably should have thought of this), one can simply use the package index to pull a list of 3.0 compatibles: http://pypi.python.org/pypi?:action=browse&c=533. I guess a good starting point would be to start with useful packages that aren't on here and go from there. I was really looking for more of a community effort page as it's quite easy to figure out what a specific package supports.