When creating the Configurable Products Utility Magento extension, I had to figure out how to create an additional tab in the product admin. I found a few examples on the web, but none of them seemed to function exactly as I needed. It the end, it was not that difficult.
I created a few Magento Extensions while working on DevoutGeek.com, The first one that I created was Configurable Colors. Configurable Colors is an extension that enables you to create color swatches for Configurable Products. You can create swatches using HTML Color Names, Hex values, and images. This extension also comes with image zoom. Below is a video that demonstrates the use of Configurable Colors.