Symfony2 is a promising PHP framework to be released in late 2010.
For now, you can see if you like the features of Symfony2 and toy around with the sandbox.
The features include (but are not limited upon the release) those of Django, Spring, and other powerful frameworks; however, the main emphasis here is on speed.
Symfony2 is up to 2 times faster than the last version of Symfony, and three times faster than Zend Framework.
Symfony is easy to learn, and could even become a framework to migrate to–when it’s released, of course.