PowerPoint presentations are a great way to send your message home. The audience is yours for the taking and for the moment they are all focused on your message. Make sure that the images and test you use is consistent with the rest of your Marketing program, that your PowerPoint slides always reflect your style and that they look as professional as all of the other Marketing materials you are using.
Remember to use PowerPoint as a tool in your presentation and not as a crutch. Practice what you are going to say, then say it with an expert's delivery. A picture can say a thousand words, but remember to be the comander of those words and pictures so that they always enforce your message.