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.