Component Factory has released a free set of Windows Forms user interface controls. It's called the Krypton Toolkit and it's targeted at Visual Studio 2005 and .NET Framework 2.0.
It's free for commercial use. It includes several controls:
- Krypton Button
- Krypton Group
- Krypton Header
- Krypton HeaderGroup
- Krypton SplitContainer
- Krypton Panel
- Krypton Label