And this is good news. I've quite regularly on this weblog called for a better adoption for PHP5. PHP5 is in just about every aspect better than PHP4. Unfortunately adoption has not been very good in the past. It was a bit of a chicken/egg situation, where hosting providers didn't want the hassle of upgrading because so many of the popular PHP software was still in PHP4, and on the other end a lot of the popular PHP software didn't want to make the jump because so many hosting providers were only offering PHP4.
Well, guess what? Now is the time to make the jump. With more and more hosting providers offering some kind of support for PHP5, it's now possible to make the jump. Do it! Go for it! Any serious developer won't regret it.