RadControls for WinForms Q3 2006 (v1.0.0.0) Release notes:
Telerik Presentation Framework (TPF) - an unique architecture, which follows WPF's (Avalon's) best practices
Dynamic CSS-like styling and centralized Themesmechanism for complete control over UI elements
VisualStyleBuilder - a tool which enables designers to freely customize the UI
RadControlspy - a developer's tool that lets you examine the detailed internal structure of any Telerik Radcontrolwhich is currently running and alter its properties.
Unlimited nesting of UI elements with automatic inheritance of parent properties and behaviors