Web Application Installer
This is the second tool from Microsoft that lets you install web based applications. It includes both ASP.NET and PHP, free or open source applications and is configured automatically to work on Windows.

Choosing the type of install.

When you run the WAI file, you are shown a number of different applications that you can install. Some of these require PHP and MySQL to be installed on IIS beforehand. (Note: currently the Web Platform Installer doesn't install these, but the next release is expected to automate this as well.) If you have run the WPI and installed PHP and MySQL, you can choose from the list of Web applications shown.

The “NEW” tab shows latest and cutting edge stuff.

Once you have chosen the application you wish to install and proceed, you will be first prompted for the web site on the local machine and the virtual directory name you wish to assign. Proceeding further, you will need to give the specific configuration that the chosen application needs – for instance, database information, usernames and passwords and more. Proceeding further will let the tool check the system to see if it meets the compatibility required. If it doesn't, it informs you of the same so that you can correct the errors and proceed. When it does, it downloads the Web application, and configures the database and application accordingly. Once it completes, you are presented with a fully installed and configured version of the application you chose – whether it is on ASP.NET or PHP/MySQL on Windows.