You can allow users to rearrange tabs at run time via a drag-and-drop. Once dragging begins, the tabstrip will hint where the drop will appear by showing visual pointers in between tabs. You can turn this option off entirely by setting the AllowDragDrop property to false. 

If there are more tabs than can be displayed, you can use tab scrolling and overflow management. With tab scrolling, you can use arrow buttons for left and right navigation. Or you can navigate to the needed tab by using the overflow button which lists all available tabs.
The buttons can be positioned anywhere around the tabstrip. 

You can choose from predefined tab shapes matching those used in popular applications such as Microsoft Internet Explorer or Microsoft Visual Studio. If that’s not flexible enough for you, use the built-in Shape Designer to come up with a custom shape using any combination of lines and curves. Shapes can be saved and reused as often as you like. The Shape Designer gives you the extra edge in customizing each tab's appearance by creating curved designs with Bézier curves. 

You can automatically manage other controls on embedded content panels. Place any control from the RadControls suite or elsewhere on a content panel associated with a RadTabStrip, and it will only be displayed when that tab is active. This is the quick and easy way to build a modern tabbed user interface and gives you flexibility when building applications which require complex UI.

RadTabStrip delivers convenience with integrated keyboard support. Once the tab gets the focus, you can use the arrow keys or the Tab/Shift+Tab keys to navigate through the tabs.

With RadTabStrip, tabs can be displayed in horizontal and vertical orientation, either at the top, bottom, left, or right of the content panel. All you need is to set the TabsPosition property to Top, Bottom, Left or Right and the TextOrientation property to Horizontal or Vertical.

Text within each tab can be angled to fit your particular case, regardless of the tab orientation. You can have it horizontal, vertical or at an arbitrary angle.

Images and text can be displayed on tabs as well. You cam customize the image-text relation by setting the TextImageRelation property. Possible values are: Overlay, ImageAboveText, TextAboveImage, TextBeforeImage, and ImageBeforeText.

RadTabStrip supports multiline text in its tabs - instead of truncating long text, it is displayed on several lines. This is achieved through a label which RadTabStrip uses for its text field.