SlideProof is a neat PowerPoint plug in that cleans your presentation of common small mistakes - automatically. Misaligned boxes, titles, wrong page numbers, you name it. A bit like the Roomba vacuum clean robot, a spell checker on steroids. You have complete control over the changes though, so nothing unexpected will happen to your slides, which is crucial since my guess is that most of the vacuum cleaning of presentations will happen just before the live presentation.
Fixing small mistakes might not be crucial to get your message across, but it does make a huge difference in the overall impression you leave behind. A bit like polishing your shoes.
SlideProof only runs Windows so I did not have a chance to test drive it myself (I work on the Mac platform). Please share your experiences in the comments if you managed to check it out.