Richard Davey has a quick post noting the update of his WAMP Guide (a step-by-step method for installing Apache/MySQL/PHP on a Windows XP machine).

Just a short entry to let everyone (and the search engines) know that I've updated my comprehensive WAMP guide so it now covers PHP version 5.2.3. I always had a help file on how to upgrade to 5.2.3 at the end anyway, but now that 5.2.3 is officially released I updated the core guide to reflect this.

This tutorial is a "comprehensive guide to installing and running Apache 2.2.4 with PHP 4.4.7 and PHP 5.2.3 on Windows XP. It covers all of the steps in detail with lots of screen grabs so you can follow the process visually."