A Victorian Gentleperson's Guide To Steampunk offers an introduction to the Steampunk genre.
It offers plenty of recommendations for novels, graphic novels, films and RPG -- available at the Steampunk Stores : UK or US. There's also a brief guide to Steampunk as a genre and, in future, I hope to add a Reading Room with classic Steampunk texts and more detailed articles.
If you have any ideas, comments or suggestions (of the polite and helpful kind), you can get in touch.