The default mirror SF picks for me is internap in San Jose. Seems the 0.5.0 download isn't there, and gives an error. I originally got this error while trying to easy_install Sphinx.
This is a SourceForge issue. Docutils can't do anything about it, sorry. You can submit a support request here: http://sourceforge.net/tracker/?func=add&group_id=1&atid=200001
Okay, I reported the issue here: