Incorporate audio into computer presentations. Most rooms have inputs for computer audio. Incorporate sound effects or audio clips into presentations. Try not to rely on the Internet. If you are displaying web pages, download them before class and save them to disk.
Network connections can be slow and unreliable at times.
Invest in a wireless mouse. It is helpful to be able to advance pages from across the room. The computer is an extremely powerful and flexible tool. VCRs Always use the highest quality version possible. VHS videotape does not stand the test of time very well, and does not hold up over several generations of copies.