PHP 5 in a live application

All, I understand that PHP 5 in only in beta, and that it would be bad practice (please correct me if I'm wrong) to implement a beta release into production (although phpmvc does it), has anyone attempted this? I read the post about pidget and thought that perhaps I could begin to develop using PHP 5 (which I am very excited about). Also, I just bought Core PHP Programming 3rd Edition, it's awesome!! It's "fully revised for PHP 5" so I'm very eager to start with it. I'm going to be starting development on 2 new projects with a company which has never worked with PHP (I have, the rest are mainly, Java, Microsoft, and Domino developers), so I'm pretty excited about pioneering this change. Thanks in advance.