Thank you for writing.
You can display a RadLabel under a 45° angle by setting an AngleTransform. You have to use the RadLabel smart-tag and select Edit UI Elements and set the property of the top most element. Refer to the attached image to get a visual idea where the property is. Then you have to set a MinimumSize of the label so the whole text can be displayed within the control bounds. And finally you should set the TextAlignment property so the text would be displayed properly when you run the application.
I hope this will help. If you need further assistance, I would be glad to provide it.
the Telerik team
Q2’11 SP1 of RadControls for WinForms is available for download (see what's new); also available is the Q3'11 Roadmap for Telerik Windows Forms controls.