Eclipse has a presentation API which lets you change the look and feel of the application. Willian Mitsuda has created a new look and feel or skin for Eclipse as a plugin so that it looks like Visual Studio.Net. The source and binary is available in Source Forge.
Martín Pérez has used the look and feel in his application and describes how to do it. Eclipse is the application I look at most of the time. It will be nice to change the looks time to time. For not I am using the VS.Net look.