How quickly to move up the version numbers with PHP and MySQL isn't an easy question to answer is it? I know many of us are constrained by what hosting companies have to offer or if we're running other other less up to date applications on the server. A while back I blogged about Wordpress dropping MySQL 3.23 support and even Dries felt compelled to reply on the post.

I just moved all my Drupal sites that I host to PHP 5.2.x and I'm happy to say I haven't had a single problem. I wish I can say that for all my applications which is why many host providers are reluctant to drop PHP 4.x from their servers. Though dropping PHP 4.x might just be the thing to give users the incentive to chip in and help their open source communities with updating their code...