Submit your apocalyptic works for review to Strange Horisons. Your target audience is there and the more publicity the better! Also look for bloggers that review novels and other works of apocalypse literature and submit to them as well.
If for no other reason than to get another persons view on your works. Do it before you're ready to publish and treat the review like an editors comments. There are lots of opportunities out there to get feedback on your work.
The Judas Syndrome is slated to be published in the Spring of 2008.