Add Custom Tabs to the Magento Product Admin

In Magento eCommerce, it is possible to add new attributes to product models and edit the values for these attributes on the Product edit page. This is fine if we only want to add standard data (attributes) to a product, but what if we wanted to do something a little different?
This article explains how to build a simple custom Magento extension that will add a new tab to the product edit page and provide a facility for processing that data when the user hits the Save button.