The 7 Habits of Highly Effective People by Stephen R Covey has some good sections on time management which you may find useful if you like to manage things relating to overall objectives. He has a whole system of planning your week, etc.
Control Your Day: A New Approach to Email and Time Management Using Microsoft Outlook and the Concept of Getting Things Done by Jim McCullen. This uses Outlook to manage your time and requires commitment and follow through. Worth a read.