Keep your visuals simple and uncluttered. Abbreviate the points, and use your presentation to fill in the details. Consider emphasizing important points by using color, shading, lines, boxes, or other graphic devices. Use plenty of white space on your visuals. Use separate visuals instead of crowding too much information on one.
Legibility is the highest priority.
Make sure lettering is visible from 50 feet. When you are not using the projector, turn it off. A blank lighted screen attracts attention away from your talk. For those who would like further information or a copy of your complete paper, add your name, address, fax number, and e-mail to your handouts. Include a bibliography and reference list.