On the SitePoint PHP blog there's a post from Bruno Skvorc introducing the Pagekit CMS, a content management system that's "clean, extensible and fast" (but it does come with some caveats).

Pagekit hit version 1 recently, and as I’d been looking at personal blogging engines, I thought it’d only be fair to check it out. Granted, blogging is merely a subset of the functionality Pagekit can offer, but a good basic test-drive subset nonetheless.

He walks you through the installation and configuration of a new Pagekit-based site using their own installer script (after downloading it from their site). He then goes through some of the basic features of the CMS including native Markdown support, how the editor looks and how the results render. He includes a guide on setting up a blog too using a "blog" plugin and an extension to add in better syntax highlighting. He also looks at other features of the CMS including custom layouts and "pretty" URL support. He points out some security changes you'll want to make out of the box to protect sensitive files and briefly touches on deploying the site to production and links to their own guide for additional help.