The community has responded to the fact that PHP4 is officially "dead" with a few posts to their blogs. Here's the list so far:

• Havard Eide - RIP PHP4
• Christian Wenz - PHP 4.4.9 Released (And Why You Should Be Worried If You Consider Installing It)
• Stefan Priebsch - PHP 4 is dead. An obituary
• Derick Rethans - RIP PHP4
• Sebastian Bergmann - KTHXBYE PHP 4
• Stefan Esser - PHP 4 - Requiescat in Pace
• Paul Jones - My Birthday Present From php.net
• Ken Guest - PHP 4 - this parrot is deceased!
• Christopher Jones - PHP 4 final-ever-last-terminal release is available
• Chris Shiflett - End of Life for PHP 4
• David Coallier - Small Goodbye to PHP4
• Gennady Feldman - The last day of PHP4
• Jacques Marneweck - So long and thank you for all the fish, PHP4
• Daniel Cousineau - End of an Era (Goodbye to PHP 4)
• Travis Swicegood - Today is the day!
• Lukas Smith - A short goodbye to 4.x
• Bill Gaffney - PHP 4 ends its life with final release 4.4.9
• ComputerWorld - PHP 4 is dead, long live PHP 4
• Evan Sims - PHP is dead, long live PHP! (finally.)
• Matthew Weier O'Phinney - Zend Framework 1.6.0 Preview, or, PHP 4 is Dead
• ZDNet - The Last PHP 4

If you aren't sure what they're talking about - the last day for official PHP 4 support is today, 08.08.08. Only PHP 5 will be supported from here on. It is highly recommended that you upgrade your applications to run on the latest PHP 5 version, 5.2.