PHP 5.4 Traits
PHP 5.4 adds traits - a means of mixing in behaviors from multiple sources. Think multiple inheritance with some twists to make it manageable.
Check out this example
http://code.atavisticendeavor.com/using-traits-in-php-54
Or this post showing off some of the sugar:
http://simas.posterous.com/new-to-php-54-traits
