I find I don't make New Year's Resolutions so much as re-focus on initiatives I already have in place. The December traditional holiday season (Christmas and New Years) and the attendant increased social activity can be a bit overwhelming. Couple that with the modified work schedules because of different business hours and such, and one can lose focus of goals (health, career, leisure, hobby, and more) during this hectic time.
Therefore, when everything returns pretty well to normal in the first week of January, I typically put my nose to the proverbial grindstone and tackle projects (work and otherwise) with renewed focus and energy. This is exactly what I am doing this first week of 2013, with a special emphasis on my career goals.