Activate/De-activate site feature (Automation) e.g. SharePoint Publishing
Nintex workflow provides functionality to automate site creation removing in the "admin" and dependency on a human to create sites e.g. project sites.
We are still not able to automate the enabling of the SharePoint Publishing feature automatically. This means that we can only semi-automate site creation.
I'm sure there are many users who would appreciate being able to enable/disable SharePoint Publishing and other site features using a workflow/web service.