md2blog: creates a tiny (a few kilobytes per page, with no JavaScript) blog from Markdown files, with two features that I couldn’t find elsewhere:
* Links between Markdown files “just work” (both when viewing the Markdown source on GitHub and in the final HTML version of the site), including anchors
* Posts are automatically tagged based on directory structure (e.g. all files in “posts/linux” are tagged with “linux”)
Bonus: my entire site hot-rebuilds on my 12 year-old netbook in under a second (with a few tweaks that I should probably publish a new build for).