There should be a standard URL on the web site to reach the
documentation of the current stable release of Python 3.

http://docs.python.org leads to the documentation for Python 2.
I can get to Python 3.1 documentation, but I have to specify 3.1 in the
URL: http://docs.python.org/3.1
That means that I cannot publish material on the web or in hardcopy that
refers generically to the documentation of a particular module via URL
without specifying a version, and that version will be obsolete before
long. I don't know what the URL should be -- perhaps docs.python.org/3/
would be sufficient.

This is one level up from the current arrangement in which specifying
3.1 actually currently gives me the 3.1.1 documentation.

The "current" 3k docs are at docs.python.org/py3k.