One of my favourite apps to sit down with and learn is Qwiki. Qwiki must have millions of ‘articles’ that are actually interactive videos. Using the simple english from wikipedia and a series of photos and videos from wikimedia, Qwiki generates videos that you can watch, pause, interact with, and explore new learnings.
A feature that I fell in love with while at ASCD12 in Philly is the location feature. Qwiki takes all of their video articles and embeds them on a map, allowing you to explore the area around you or an area you might want to visit to learn more. I can imagine some pretty awesome history lessons, going on a virtual walk around a place as historic as Philadelphia using Qwiki and watching videos about the formation of the United States of America.
Check out this video introduction to Qwiki. I hope you enjoy it as much as I do!