Black Hat Miniatures released their Venus supplement for Martian Empires, and it can be downloaded, for free, right from their website.
From the release:
The supplement for the Martian Empires fastplay Victorian Science Fiction Rules is now available as a free PDF.
It can be downloaded from the Martian Empires yahoo group or directly from the Black Hat Miniatures website
The supplement covers the Lizardmen forces list, some scenarios and contains updated lists and an FAQ for the Martian Empires rules.