Fitzgerald is a tiny PHP framework that was inspired oh so heavily by the wondrous Sinatra of the Ruby world.

See example.php for a look at how to use Fitzgerald, and read the blog posts: 
    - http://autonomousmachine.com/2008/11/21/fitzgerald-a-sinatra-clone-in-php
    - http://autonomousmachine.com/2009/2/3/fitzgerald-update-before-filters-and-senddownload
Have fun!