The Search for My Ideal GTD App

lifehack.org: "Over the last few weeks, I’ve been looking for an online service to help me stay organized. My system at the moment is a patchwork of paper, desktop apps, and willpower that has worked well enough in the past but has begun to come apart at the seams as I take on a growing number of responsibilities. Since I work at several different locations, I need to be able to access a single source where I can access tasks, files, and reference information — from wherever I happen to be."