This is a simple Mercurial extension which adds an "eggtag" command.
When you want to make a new release, just type

 hg eggtag 0.1

The command will automatically tag and add an entry to your egg's
release-info file corresponding to this release.

You only need the python file (can be downloaded using the source code
browser, and then viewing the "raw" source). Just drop it in your ~/.hg
directory and add the following to your .hgrc:

[extensions]
egg-author=~/.hg/egg-author.py