Why PHP 5 Rocks!
Adam Trachtenberg - Why PHP 5 Rocks:
"Fortunately, PHP 5 improves on PHP 4 in three major areas:
* Object-oriented programming * MySQL * XML
These items have all been completely rewritten, turning them from limitations into star attractions. While these changes alone warrant a new version of PHP, PHP 5 also provides a plethora of other new features."