DevShed has a new article posted today covering some of the new features in PHP5.

The long anticipated PHP 5 release comes with a slew of new features aimed at simplifying development with PHP. With PHP 5 comes the introduction of exception handling, the Standard PHP Library (SPL), enhanced support for XML, reflection, and quite a few enhancements to the object oriented features of the language. PHP 5 also offers a sizable list of new functions, many of which will not be covered in this article but are available in the manual.

The other pages cover topics such as: database support, Standard PHP Library: exceptions and iterators, and OOP: Object Enhancements. It's a good general overview, but don't look for much in teh way of specifics here. You'd be better off Googling for something more detailed...