Looking over the referrer stats, it seems that many people reach this blog through Google searches more or less aligned with “How do I install PHP on IIS?”. I think XAMPP might be a better, and easier answer for many about to embark on a frustrating journey.
I can appreciate the need to install PHP under IIS for some purposes. For instance you need your application to co-exist in an environment where you are subject to the existing infrastructure, ranging to the more rudimentary “It’s what the client wants” concerns.
For the most part, I think we can all agree that few, if any visitors to this page would actually be building a web server to be deploy in a data-centre for production/mission critical purposes. I’d hazard that the vast majority of these visits are more interested in learning about PHP, dealing with configuration mysteries or just want a sane development environment in which to code, debug and test.