Static site generators have become popular in recent years with ones like Hyde (python) and Jekyll/Octopress (Ruby). It's nice to see some static site generators built on PHP. There's actually 3 becoming popular; Sculpin, Phrozn and PieCrust. One thing I like about Sculpin is you can fire up a local php server and have it watch for file changes to auto update the site. It utilizes a lot of Symfony components. Also emphasis for easily packaging themes.