The Linkbook Stand is used to hold Descriptive Books and Linking Books. Right-clicking on the stand while holding a book will be place it on the stand. Right-click on a book that's already on the stand and you can be teleported to another Age. While a book is on the stand, it's immune to any damage it would be receiving if it were simply placed on the ground. This will help prevent accidentally losing your age, or otherwise being trapped within an age.
For an alternative, see Lecterns.