Ribbon

Ribbon was developed to be a Microsoft Office 2007 Ribbon Bar - like control for .NET.
Performance - This ribbon is contained on a Control window, and every element inside of it is managed as a bunch of bounds inside the control, just as the ToolStrip control does. Altough this is difficult to manage from the ribboons inside code, this is a way to keep it at the best performed ribbon. Believe me, download the demo, run it and resize the window. It peforms beautifully.
Consistency with Offices ribbon - I read once about Jakob Nielsen saying that most users prefer the programs they use look just like word, excel or powerpoint. This is quite obvious, because people use this software every day. Providing visual consistency with the offices ribbon is very important because people already know what to expect from a ribbon-like interface. Ive tried to every element in the ribbon look and behave exactly like it does in the Offices ribbon.
Ease of use for programmers - The naming of components is consistent with most WinForms names, even more with the ToolStrip elements. Property, event and method names for similar elements are named just like in the ToolStrip technology items.
Designer support - I will be adding more and more designer support so you can manage the ribbon 100% from the designer.
The ribbon is located in the System.Windows.Forms namespace, just as every other control, I think its annoying to use controls named as MyCoolFirm.MyCoolNameSpace.MyCoolSubNameSpace, and so on (Please do that only for bussiness objects).
You can add a reference to the compiled dll: System.Windows.Forms.Ribbon.dll or you can directly copy the source files to a folder on your project. The code is currently designed so you can just copy the source files, it doesnt need any extra resources.