I really am trying to implement a working GTD system for myself, and a wiki seems potentially very valuable, as I have many different contexts but many of them are related. I would love a wiki I mirrored/synched across iPhone, Mac, and my web space. Probably asking for too much and I don’t have the chops to develop it myself. This is a possibility: Mobile Wiki Server, a $3.99 app for the iPhone; how much of a hassle to sync, though? More on this later.