It wasn't exactly a New Year Resolution, but near the beginning of last year I decided to give up soda. I went from having one everyday to perhaps 10-15 sodas over the entire year. Started drinking green tea everyday.
I did the same thing. I still have a soda occasionally, but I drink Green Teas a lot and also the Vitamin Waters from Costco (Warehouse place, Sams Club is the same way). They're really good, especially the Mango.