9Slides is a excellent site/app (Android/iOS) for taking a presentation and then adding a video narration. This is a ideal for the Flipped Classroom model and for Guided Instruction. It's a very user friendly tool and supports all sorts of video (i.e. Keynote, PPT) formats for upload. Finally, a finished presentation can then be shared via a URL or embedded into a site or blog.
I highly recommend checking out 9Slides by clicking here!!!
Below is a brief demo video of the free iPad app in action...
*9Slides is an advertiser of Technology Tidbits.