Alacrity

Awesome tip from Lifehacker (I've always wondered how to do this):

Save your PowerPoint presentation as a show:
"Loyal reader Mark writes in: If you want to really impress people with your PowerPoint, save the file as a .pps

This is a PowerPoint Show. Most people save them as a PowerPoint Presentation (PPT). A PPT shows the slides and the work that can be done on the presentation. By saving as a PPS (PowerPoint Show), when you double-click it, it will auto launch into the show mode. It makes it look so much more professional. I've always seen presentations where people open the PPT, then go to Slide Show > View Show. This cuts off that step.

Make sure you also save a PPT copy to work on it, but make your final output file a PPS.

Since, for whatever reason, PowerPoint presentations seem apt to go wrong, it's a great idea to cut out at least a couple of extra steps; not only will your presentation look more professional, but there's also less of a chance that something will go wrong between saving and presenting. — Adam Pash "