Gapminder

I found a quite interesting presentation which Dr. Hans Rosling gave four years ago:

The tool he used during the presentation was Gapminder World (http://www.gapminder.org/) and you may find some graphs interesting.

Live streaming tool

If you have a webcam on your computer or iPhone, you can broadcast your classrooms for online students using USTREAM. During the live session, you can share your desktop and chat with your students. There is also a recording function, and so you can watch your session later. Most importantly, it’s free!