Fret Zealot provides a host of scales, songs, and chord types to choose from along with an an easy to use interface. The system is a very useful tool for beginner or intermediate players looking for a way to jumpstart their learning process. It is a very unique product and I can see how useful it can be for many players.
Fret Zealot is also about to realize a portal where anyone can create fret Zealot data for any Youtube video. Fret Zealot also allow 3rd party apps such as Guitar 3D or Uberchord.
For more information on Fret Zealot: http://www.fretzealot.com
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