[denrael]

I've played with both Omnifocus and Things, because I tend to be a tech junkie. I keep coming back to Life Balance however. It's been around since the days of the Apple Newton, and runs on Palm, iPhone, Mac, Windows. Even though it is older than GTD itself, it follows the GTD principles quite well. It also has a few features that OF doesn't have such as being able to continue to break tasks down into smaller chunks, and to set open and close times for locations (contexts).