The Telerik buttons will serve three purposes:
1.Use the themes as the rest of the RadControls - you will not need to style all your buttons - now you've got this for free
2. Commanding suport. We have addedRouted Command support for Silverlight controls and now by using the Telerik buttons you will be able to use the Command pattern. This pattern is very usefull in a large business applications. We also suport CommandBindings and Custom Commands. The most notable examples are when using buttons in Toolbars, Ribbon, Menu, ContextMenu, etc.
Basically our implementation of commands mimics the one in WPF. You can read more here:
3. Also DropDownButton and SplitButtons are very usefull and they come in handy in many LOB scenarios and they are part from every busses application.
All the best,
the Telerik team