I remember trying out Getting Things Done, really liking the idea, and then finding out I had only crappy ways to reference an email from my "todo list". Enough of my "work" is "respond to this email" that I've never been able to escape my inbox as one of my todo lists. Any ideas on how to build task planning that lets me include link directly to an email?
Found it several years ago and used it regularly for a while. It has a nice mixed model for blending calendar, email, lists, tasks. Lots of drag and drop capability, keyboard shortcuts. Loads fast. Mobile app. Customizable views you can quickly switch between, e.g. 3 column email on left, tasks in the middle, calendar on the right.