I have posted a link on here to some youtube videos for Aurasma.  Aurasma is an app that I used in my classroom last year.  It has changed the way I teach Social Studies.  The app allowed me to help the students connect to history.  Students were able to learn about the people who have influenced our society by watching speeches and videos of what thing looked like long ago.  I was amazed at how the students were able to connect and remember details of history.  This year I plan to use it even more in my classroom and very early in the year.
Check it out.  If you think of any other uses post them :)