Jeremy Wright in a June 2002 article at A List Apart gives a good summary of Time Management: The Pickle Jar Theory that is very similar to a demonstration that Steve Covey does in his time management workshops. Here is the important bit:
I strongly encourage everyone to use at least one Time Management System. It empowers you to actually do instead of scurrying about without any goals in sight. Whether you choose this particular system or not, remember: eat the pickles before you empty the jar, they are so good!