I'm really surprised that one has yet to mention this book / system - Time Management For System Administrators:

http://oreilly.com/catalog/9780596007836/

This is a wonderful system focusing on goals, priorities, proper breakdown of tasks, stress management, relaxation, maintaining focus, etc. It gives a wonderful breakdown of how to manage planners, and this system has been working for me for years now. Hope you find some value out of this!