Clarify complex information. Never make the visuals the main attraction. In a long presentation sitting for a segment is accepted. Speakers should not move around if there is a podium. Usually a podium restricts movement.
Movement is often very useful and desirable.
You should always look at the audience and at different people. You should always check with the organizers that all the equipment works. When using overhead transparencies you should always use a pointer. When using a pointer on the screen, make sure you don t keep moving it around. Using notes is acceptable.