Been playing with this for a couple of days. Requires Ruby to generate and slots nicely into "really don't want YABCMSInstall to keep updated, but want a bit more flexibility than static pages".
Jekyll is a simple, blog aware, static site generator. It takes a template directory (representing the raw form of a website), runs it through Textile or Markdown and Liquid converters, and spits out a complete, static website suitable for serving with Apache or your favorite web server. This is also the engine behind GitHub Pages, which you can use to host your projectís page or blog right here from GitHub.