On Alexander Netkachev's blog today, there's a walk-through of a light and easy method for getting PHP and Apache up and running. It makes use of the Installer Technical Preview utility to make live simpler.
I created the installer, which primary goal is to provide the developer with command-line tools for basic Apache/PHP/MySQL management tasks.
This a preview version of AMP installer and configurator. Although, it is very far from being a real time-proven and tested installation method, with your help and effort we can make it better.
There's a link for the download and a brief How-To on using the package to get things up and running quickly. There's also two things on the To-Do list for upcoming versions - installers for various other databases and support for automatic installation of modern PHP applications (like WordPress, phpbb, etc).