I'm completely confused about how to choose the best GTD software. I tried using an gtd outlook add-in but some of the lists didn't sync with my blackberry so I'm thinking about starting from scratch and buying an iphone. Problem is, I still want to use outlook for my email. So...that means I need a GTD software program that's compatible with windows but designed for the iphone. To confuse you even more, I may even consider getting rid of outlook if another email manager is integrated with the GTD software that you recommend. Thanks for your help!