I came up with this About text for the tool.
Below is a screenshot on how it looks:
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Here's the text:
Versionner is a GUI for
Metacello that allows you to use a nice (but limited, as
are most GUI tools) tool instead of writing configs by
hand.
Metacello is a package
management system that declares dependencies between
those packages in
configuration classes.
Monticello is our SCM
system that groups code into packages.
For a tutorial video
on how to use Versionner: