John Ringo has created a website for his upcoming novel The Last Centurion. You can find it at www.thelastcenturion.com.
Like the novel, it's written in the first person. However, it appears to take up after the conclusion of the novel, which may or may not constitute a spoiler. In particular, I'm eagerly looking for hints on whether the novel ends with devolutionary spiral to collapse, or with hints of a renaissance to come. The mentions of telephone lines and Internet do seem to suggest that the post-disaster world will not be a reversion to pre-Industrial society.