EmbryoCore is a blog / content management system written using PHP5's newest features. Highly customizable, XHTML:Strict compliant, with full integration of jQuery for dynamic ajax-powered content.
Easy to use, and the code is easy to read and figure out. I didn't even need to read any docs, and could quickly figure out how to write a plugin and stuff. The interface is really slick too. The blocks administration is a big feature that I don't see in a lot of other small cms projects. This was a big selling point for me. The memory consumption for the front page was only 2.5 mb or so. Pretty darn nice, especially to a drupal user like me. The only concern I have right now is that there hasn't been any activity in the last year, from what I can see. I'd love to know if this project has evolved into some other project, or if the author still wants to see this project thrive...
I like it so far. I could be more specific but want to see how it comes along. I'm setting this up to test and you can contact me for anything related to contributing.