On the PhPL33t blog, there's a guide for automating the creation of email addresses with the Plesk administration application:

In 2003 I wrote "Plesk Auto Email", the first fully funtional Plesk email automation suite. Now, I am going to show you how to do it. You will need a dedicated server with Linux, Plesk 7.5 and higher, php5, mysql5, and root access. This will show you how to code the auto creation, I am not going into deletions and edits at this time because I don't have all night to blog.

Included are the database table to store the commands in, the PHP script to create the commands (the integration into the other piece of software) and the PHP cron script that looks in the command table and executes each as it goes through.

The phpaddiction website has posted the first part of a series today covering URL routing with PHP (commonly used by frameworks to route requests through a centralized location.

Most PHP frameworks use some variation of the front controller pattern to centralize common code and logic. There are advantages and disadvantages to this. I am going to ignore those for now. In fact the first part of this series will explore a simple procedural URL routing method that contains many of the disadvantages. In later articles we will build upon this basis and address the disadvantages.

He walks through the steps to get things set up - working with mod_rewrite, creating the "entry point" for your application, and finally, how to execute a command based on the request's action.