The document camera, found in almost all LSA classrooms, provides a more robust alternative to traditional overhead projection and exciting possibilities for faculty. It is incredibly easy to learn how to use, and can help add some dynamism to your classroom.
The video below shows how you can easily show a large classroom an experiment that would be difficult to show otherwise. Note the use of the zoom function.
Here is another example from the field of biology. This same principle can be applied to any small artifacts or art you would want to show your students.