We've started marking redirects within each one of the archive
snapshots. Starting on 7/28/09 each history and article snapshot will
contain a
<page>
..
<redirect />
<revision>
..
</page>
entry so that everyone can easily identify which articles are in fact
simply redirects.
This came as a request from Erik Zachte to further improve on our stats
collection and has allowed us to surface more user contributor stats
that are not filled with articles lacking significant content.
--tomasz