Great thread, I've made a big breakthrough this year for me, staying consistently at a 5 or lower for a lot of the year. Now trying to get to scratch, which will be a challenge, but I'm excited about pursuing it. Lastly, hit my best scores ever this year, with several 73's and a 72. Here is a list of some items that have really helped me.
1. Learn to play relaxed, quit caring so much and enjoy the ride. I use to put a lot of pressure on myself to perform, which usually resulted in a bad day on the course. I now approach the first tee with absolutely no expectations of score, swing, etc. Just play, enjoy the day and add em up a the end.
2. Bogey is sometimes a great score. Use to try to always save par, if I was 220 out into a howling wind, and needed to hit a high draw, I would try. Now, I've learned to concede that sometimes you need to save par with the putter, if you don't so be it. Take your medicine and move on, don't make it worse.
3. quit focusing on the pin. for instance on a couple of holes at my course, they are protected at the front by a bunker. All I worry about is what I need to hit to carry the bunker, I get yardage to the back lip of the bunker and don't really worry about the pin. Anything on the green should result in par at worse.
4. miss on the correct side, don't go chasing sucker pins, can't tell you how many times I see people chase a back pin, hit the ball right on the yardage and it hops long, now they are short sided and dead.
5. shoot for giving yourself uphill putts, I'd rather have a 15 footer uphill, then a 10 footer downhill.
6. hit the shot you are capable of hitting and nothing else. ie: quit using your 60 degree wedge around the green, when a putter would work
all of this is probably pretty obvious, and has been written about, but hopefully it will be helpful for someone.