For my most recent New Year's Resolution, I was inspired by this question:
What is the one change in your behavior that you can make now that will have the greatest impact on your life?
I am not sure where I first heard or read this recently but I was able to IxQuick it just now and find at least one hit so I know that it is not completely new. If you know of the original source, please post the reference in a comment.
My resolution for 2012 was to stop watching television after 8:30 PM. This decision was partially based on reports that screen time before bed can impede sleep. It was also based on my hope that it would increase my reading to viewing ratio.
I was a little reluctant to commit to this as I do enjoy my Roku. So far, though, it has been working out as I am usually able to read myself to sleep with a little help from diphenhydramine. I am hoping this new habit has all sorts of direct and indirect benefits for my health and productivity.