Task Management System
Clear - "Clear helps over 2 million people lead more productive lives."
Any.do - "Any.do makes it simple & fun to get things done."
FollowUp.cc - "Quickly schedule tasks and reminders right inside your email." ($12/mo for Drive, Calendar, and Dropbox integration)
Task Management Philosophy
NY Times: "One Thing After Another" (Sandeep Jauhar) - a book review of "The Checklist Manifesto - How to Get Things Right"