From PHPEverywhere:

One of the key milestones in the health and stability of PHP5 is when Zend, a company with more PHP expertise than money and wishes it were the other way around, releases products that support this new version of PHP. Yesterday they released the Zend Encoder and Optimizer for PHP5. Things are moving along...

As more and more tools get tailored towards PHP5, the adoption rate will skyrocket - especially performance enhancing applications/code. Of course, that's inevitable, given that PHP5 is the future of the language.

It's the "yet" that's still bothering some people...