We've now got a PyPI mirror setup for use with easy_install and buildout. The host is pypi.netsight.co.uk. To use it add the following line to the [buildout] section of your buildout config file:
index = http://pypi.netsight.co.uk/
You can also use it with easy_install as well:
easy_install -i http://pypi.netsight.co.uk/ foo.bar