XAMPP

www.apachefriends.org/en/xampp.html

WAMP stack in a box with a simple Windows interface. I use this as a simple PHP/MySQL development environment and it does a magnificent job at it. Simply install and go, there is little to no configuration necessary to get a running dev server. Now I wouldn’t recommend it as a production server because server administration is supposed to be complicated (make the admin think about the config), however for a Windows/Apache/MySQL/PHP development environment, nothing competes with it’s simplicity.