We implemented such functionality based on MS Office PIA assemblies. The export functionality is provided as a standalone assembly called TelerikData at the moment. It has a single Export method that takes an RadGridView instance as a parameter. Given the very short time-frame (one quarter release) we managed only to provide export based on using MS Office COM objects through PIA assemblies. This means that you must have MS Office and MS Office PIAs installer in order to accomplish the export task. Also the export is printing optimized (black & white) at the moment. We have serious plans on providing true Excel and PDF export capabilities, but it is a company-wide effort and is related with our reporting team also so I’ am unable to provide you with a specific time-frame for implementing native export capabilities for RadGridView. Other than that in our QuickStart application you will find under the RadGridView category an example named "Export to Excel".
All the best,
the Telerik team