I made a similar resolution back in 2008, Grendels.  I selected 12 in-progress builds, all started in the previous 3 to 4 years but then set aside, and I resolved to finish 1 a month, and not to start a new kit, till they were finished.  I finished I think only 4 of the 12 in that year, but having the resolution helped me focus on finishing some kits.  I also resolved that year or in 2009 not to buy any new kits, till I had finished more stash kits.  I was able to keep that one till the end of July of that year, when I broke down on a deal that I could not pass (Monogram B-24D and P-40 combo boxing, for $10).  But having made the resolution also helped me from buying more kits.

I haven't come up with any modeling resolutions yet for 2013, but I might make those 2 again.

Outside the hobby, I'm thinking of resolving to finish the remodeling work on my house, that has been in progress since I moved here 10 years ago (my 1:1 builds take as long as my scale model builds  ;D  ), if for no other reason than that the remodeling includes creating display space for my finished models and my toy soldiers.  Everything is pretty much in storage, because I have no dedicated display space, not even shelves.  If I do make that resolution, it will make it easier to carry out the modeling resolutions, because time and money will go to the work on the house.