http://www.bbc.co.uk/news/science-environment-11523469

This one is good example of when an audio slideshow is a better storytelling method than just video. the reason is a video might have take away from the message.

http://www.nytimes.com/interactive/2009/10/14/business/economy/20091014_INCOME_AUDSLIDESHOW/index.html?_r=0