I love a big pronouncement. I occasionally make them, mostly after a few ciders, but they almost never work for me.
I'm with Steph, it's the small steps that seem to help me most.
For me, my milestones are about keeping a pretty hectic life in order. My milestones are about keeping everything in balance, so nothing in my life feels neglected. When I focus too much on one thing, everything else falls by the wayside and I feel guilty and I get distracted and nothing gets done.
First on my list is writing 5000 new words a week. It's totally doable. Molly and Maureen do this in a day, but for me, this is an achievable goal, and something that will keep me on track.
Edit a previous manuscript and get it ready for release. Three months should be what I need, so by Jan 01st, it should be live.
Eat better - I've made an effort over the past six months to really improve my eating habits. For me it's about making better choices and it's paid off, but I want to continue to work on this. For this I use My Fitness Pal and it's great, it really helps me understand that maybe I can't have the 10 am muffin and the 3pm cookie, but one might be ok.
Continue to workout. I don't have a ton of time, and getting to the gym is an impossibility, so I do at home workout DVD's, which are really effective. I started on P90X and now am working on Insanity. I can't commit to their schedule, but every second day is achievable, so usually I can manage a workout 3-4 times a week.
Read a great book every month. I'm committing to picking up a book from a genre I don't read as much and reading something new every month, whether it's literary, science fiction or fantasy. I need to broaden my reading habits.
That's it, but looking at it right now, it seems like it might be enough. I know from experience if I over commit, I'll get discouraged and nothing will get done.