Hello Slide is a site I just found out about from the excellent blog, Life Feast. This is a wonderful site for creating a presentation/slideshow w/ an audio narration. This is done by uploading a PDF and then typing the text you want to hear. HS then records the audio for you. Best of all a finished product can then be embedded into a site or blog.
I highly recommend checking out Hello Slide by clicking here!!
For my top 10 sites for creating a slideshow/presentation click here.