Here is a presentation prepared using PowerPoint and posted using SlideShare. The script for such a presentation would be added as a link to a downloadable text file. You can also add to this by using the ‘slidecasting’ feature on SlideShare, which allows you to add an mp3 file of yourself reading your script aloud.
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Here is a version using Prezi (this is a little rough — it’s my first ever attempt at using Prezi). In this case you have to work up the presentation using Prezi itself, rather than uploading or copying something from PowerPoint:
I will add some other formats here as and when suitable alternatives come my way.