RadMenu
Replacing the Default SharePoint Navigation Menu with Telerik’s ASP.NET AJAX Menu
A blog post describing how the default SharePoint Navigation Menu can be replaced with the Telerik's RadMenu.
RadDropDownTree
Keyboard Support
New help article describing how to use the RadDropDownTree control with the keyboard
How to Pre-Select a Node Based on Text or Value
A help article describing how to pre-select a node from the dropdown in the RadDropDownTree
RadPivotGrid
Export to Excel (NEW Feature)
RadPivotGrid now supports export to Excel.
RadCalendar
Lightweight Render Mode
The new Lightweight rendering mode, as its name implies, yields completely different markup making maximum use of CSS 3 and semantic HTML.
RadTextBox
Input Resizing
Improved resizing functionality of RadTextBox.
RadMaskedTextBox
LongRangeMaskPart
New mask element for the mask string.
RadInput
Validation
This article explains how to use validators with RadInput.