The Brainwave Visualizer is a great "starter" application and introduction to NeuroSky's technology. It shows the wearer the three different types of brainwave information coming off the ThinkGear chip as well as providing the ability to identify blinks.
This video includes a voiceover explanation of the information displayed.
The NeuroSky Brainwave Visualizer is works with both NeuroSky headsets and is available for free from the
NeuroSky store (but requires a headset to use): http://store.neurosky.com/products/visualizer-2-0
Feel free to reference, download and distribute this video. It is not copyrighted.