Go to the Organic Gardening forum, find the FAQs, scroll to the bottom of the list, and read the one called Organic Lawn Care FAQ.

Where do you live?
Is the lawn mature or recently seeded/sodded?

Here is a picture of a lawn in Eastern PA that is only fertilized with organic ferts. Pic was taken in July of 2010 when the neighbor's lawns were going dormant. Grass type is Elite KBG, but he gets the same results with his mother's contractor-grade KBG.

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Now I have to admit that this guy takes his lawn care more seriously than anyone...ever. But you can likely have similar results without going to all the trouble he goes to. He waters once a week, mulch mows once a week, and fertilizes with organic fertilizer. He does not use herbicides, insecticides, or fungicides on any regular basis (if at all). You can do all that. The cost to maintain a lawn organically is just about the same as with chemical ferts and all the -icides.

What he really does differently is tests his soil repeatedly. And he adjusts the chemistry of the micro nutrients of the soil to reach turf nirvana. He claims his soil chemistry is the reason for his success. I believe the adjustment of his chemistry might make it a little easier to maintain, but not that much easier.

My favorite organic fertilizer this year is alfalfa pellets (rabbit chow). Why? They cost less than the other favorite ingredients including corn meal, corn gluten meal, soybean meal, and cottonseed meal. The application rate for these fertilizers is 20 pounds per 1,000 square feet. You can go up to 80 pounds before you smother the lawn, but that amount won't hurt the grass otherwise. The grain type fertilizers are very forgiving. Milorganite is another favorite organic fertilizer. I don't use it but other people I respect swear by it. Follow the bag directions on that. You can get the grain fertilizers in plain brown bags at your local feed stores. Read the FAQ.