Role Playing titles include Space 1889 and Transactions of the Royal Martian Geographical Society which has many sample articles online. We have new role playing books and lines coming in 2009, including The Complete Canal Priests Of Mars.
Fiction titles include the turn of the century science fiction works of George Griffith and the Zeppelin-themed works of Lester Dent, the creator and author of Doc Savage.
Heliograph formerly published Diana: Warrior Princess and Forgotten Futures.
If you're looking for the newsletter dedicated Victorian colonial warfare miniatures games, they have a new site here http://www.theheliograph.com. If you're looking for the Heliograph that creates high definition motion pictures (IMAX) their site is here http://www.helio.com.au.