Ubuntulooks-Serengeti is a modification of the Ubuntu human theme currently used by Dapper. It's goal is to provide a rich user experience which blends with the vibrance of this theme.
To install choose the Human theme and then select theme details. Drag tar file to add and then click Ubuntulooks-Serengeti as your control.
For those who would like to install this theme or any other globally (ie. works with update manager) see the Ubuntu Art forum for details.