Business self-help guru Seth Godin has a few things to say about improving your presentations. (Via Seth Godin)
  1. No more than six words on a slide. Ever. There is no presentation so complex that this rule needs to be broken.
  2. No cheesy images. Use professional stock photo images.
  3. No dissolves, spins or other transitions.
  4. Sound effects can be used a few times per presentation, but never use the sound effects that are built into the program.
  5. Don't hand out printouts of your slides. They don't work without you there.