I think it is important to reflect on the past (NOTE: did not say whine about the past or sit on a problem on the past). This year was a tough year for my family, as transitions often are, but it is leading to exciting new adventures and new horizons. So this year I am keeping it simple with just two questions but ones that I think can be powerful as I enter the new year:
1) What are the most important lessons I learned this last year?
Maybe these lessons came from books, people around you, and mistakes that you experienced. Make sure the lesson is about something that you can control, not general grouchiness over external issues. For example, "I learned that those people did me wrong" is not a good lesson to learn; "I need to have better discernment by doing this in these kind of situations" is a better lesson. They might have run you over, but just avoiding them isn't going to do you much good - there are plenty more of them out there! (And maybe you had something to do with it anyway.)
2) What can I celebrate from this last year?
The most important question. Begin 2010 on a high note and find ways to recognize the good stuff and incorporate it January 1. That is the best habit you can make.