What Are Your Favorite Apps for the Classroom?

 Do you use apps to augment the learning process? How about your professors? Image courtesy of Flickr user Yatuka Tsutano and licensed under CC 2.0

Jeff Young from the Chronicle of Higher Education just put together a great piece on professors and students developing or adapting apps for smartphones and tablets that augment the classroom experience.  Coincidentally, I'm also quoted in said article.

So I throw it to you now. What apps help you learn?  How many of your professors use apps to enhance the learning experience, or at least help manage the classroom?  Let us know in the comments!