I had a PHP script that did this for a while — I would write the post itself by hand, then put it into a database; the PHP script would regenerate the site locally and take care of things like nav links; then I would rsync the static output to the web server. Once I figure out how to get it all running on the latest OS X again I'll use it again; I'm a big fan of this kind of setup. I'm sorry that I don't have specific tools to recommend for it.