We all use it. We all view it. We have seen the bad and the good, and while we definitely remember both - we only remember the actual information presented from the good presentations! Here are links to a couple of clips to help you separate the good habits from the bad when it comes to PowerPoint:
In How Not to Use PowerPoint David Airey gives a pretty funny presentation utilizing all the worst habits.
Meanwhile, Death by PowerPoint gives a presentation with some tips for good habits.
Enjoy and PowerPoint sanely! ;-)