The goal of the Flamingo project is to provide a Swing implementation of the Office 2007 ribbon container and related components. The components have consistent visuals under the existing core and third-party look-and-feels, respect the DPI settings of the user desktop and follow the core Swing guidelines in the external APIs and the internal implementation details.

The release 4.0 is very impressive:

The OfficeLAF project aims to create a high-fidelity implementation of Office 2007 UI and its Black skin as a NetBeans module. See this article on NetBeans Zone for screenshots. It is currently under development with the planned 1.0 release around Christmas.