Activity =/= Accomplishment

Prioritization:
The magic of getting a lot of things done involves working hard and working smart. There are two important parts to this:

1) Make sure you stay busy. If you have a spare hour, review your tasks and see if one can be done in that timeframe. Never give anyone the power to take you from your goals. Even the MTA: one of my best New Year's resolutions was to always keep a book, or a paper and pencil, with me on the train or bus. Some of my most productive time is on a broken (oops I mean "sick passenger") train during rush hour.

2) Organize goals both by time and task. Sure, running a marathon AND scoring a 2300 on the SATs are both great goals, but probably not for one Saturday morning. However, you may find that goals such as "learn Karate" and "learn Japanese" may be somewhat complimentary.

The main part of prioritization is making sure you're hitting upon all aspects of your life that you think are important. Everyone will be different on this, but for me general areas such as health, family, friends, finance, learning, career, etc. remind me to try to set goals in these areas, and work on them relatively evenly.

Another part of prioritization is within each goal. For example, while there's something wholesome and productive about trying to hit the gym 5 days a week, it won't help mask a cocaine addiction. Start with doable goals, and also the most important ones.

One paradoxical opinion I have regarding prioritization is that I don't believe that one should always do the most important things first. In fact, my most productive days involved doing the easiest things first. The risk of course is that one spends so much time doing the less important, easy things that one never gets to the important stuff. However, my experience is that time is NOT the chief limiting factor to a person's success, but rather the emotional baggage they bring.