Ditto with the suggestion of the suplhate of iron. Simply tearing out the moss with a rake will only be a short term fix, you'll wind up doing the same next year. You gotta hit it with the sulphate of iron to increase the acidity of your soil a little. Applying the sulphate will turn the moss black within 3 days AND your lawn will green up some too. You can rake out the dead black moss later if it bothers you. If you have rhodedanderons, make sure you give the soil around them a shot too, they love a drop of iron from time to time...
WORD OF WARNING when using sulphate of iron. Make sure you keep it on the lawn only. I made the mistake of overspraying my concrete foot paths. They all turned rusty along the edges the next day and I still have not been able to restore then to their former state (even after using acid etch on the paths...),
You can spread it dry with a hopper spreader as suggested above or you can spray it if you dissolve it in luke warm water. I dilute my suplhate of iron so I can apply it with my spray boom.