Cryogen works by compiling your posts created in Markdown into HTML using the theme and configuration settings you've setup. This is great because I can edit everything in Emacs just as I do for nearly everything else.
Here, I've been using org-mode for nearly all lists, plans and documents for a very long time. With the discovery of Markdown Mode for Emacs) I've found a new balance. With keystrokes for expanding and moving around your Markdown document that are familar to the org-mode user I've found the new mode is making creating these blog posts as comfortable as when I was creating documents in org-mode.