On the Zend Developer Zone today there's a new post from Vic Cherubini about a new PHP 5.3 only framework - Jolt.

Since [I wrote a previous framework], PHP5.3 was released and added a whole slew of features. Wanting to take advantage of them, I rewrote (and renamed) the entire framework from Artisan System to Jolt. The interesting thing about Jolt is that it intentionally doesn't come with any type of ORM or ActiveRecord classes. Because I believe that Models should be fat, and controllers skinny, the model framework is left entirely up to the developer.

The README on the github repository talks about why he decided to make his own framework, some of the features and functionality it includes and an example of it in action (a boostrap file).