In general, fonts like Arial are easier to read than Times New Roman. Use a consistent combination of sizes and character enhancements for organization and emphasis. Use character enhancements such as bold, italics and underline sparingly. Experiment by projecting your slides before the actual presentation -for example in the Core 108 lab. Do not use all capital letters except for acronyms.
Text presented in all caps is difficult to read.
Use some sort of bullet when listing items. Be consistent in the use of a symbol for a bullet-type list. Do not use a different background for each slide. Consistency from one slide to the next is very important to the overall impact of your presentation. Choose a color combination that is pleasing and easy to read.