Windows Media Player like UI with Shaped Windows Forms Controls
When you would like to build a UI like Windows Media Player or a transparant splash screen like Grouper or Adobe Acrobat has, or want to have some rounded corners on your buttons it's ofcourse possible with Windows Forms in .NET.
The article Shaped Windows Forms and Controls in Visual Studio .NET on MSDN was the cause of a whole series of articles and codesamples on CodeProject, DevX etc. about this topic.
When you want to have a good start you can use the controls of Mike Harsh. On WindowsForms.NET you download a very good looking set of controls with designer support and source code. He called it the RegionMaster controls. When you want a demo of how to use it, take a look at this MSDN TV.