Examples of Dolphin with heavy modifications

What are the best examples of Dolphin implementations with strong modifications and added functionality

We currently are developing a Flex Website and would like to add a community chapter.

But, we need to add and modify the functionality in Dolphin and would like to see examples of implementations of Dolphin with heavy modification and learn about its experiences.

In internet very many different sites based at dolphin.

And sure that any owner want to create own site more individual. So he interested to .. change templates, functional, etc ..