iAdd is an excellent app if you want to get out of the "add things to a list and then cross them off" world of productivity. It incorporates much from the GTD world (such as Contexts), but really shines in the area where GTD leaves off - where we assess whats important to us and make decisions based on what we want to do.
The app is based on Dragos Rouas Assess-Decide-Do framework - without an understanding of this framework, it could easily be mistaken for just another to do list with what seem like some extra useless steps. I strongly suggest that the user takes the time to learn the framework (links are in the app) to get the most from it.
Highly recommended!
lymanreed about iAdd