Share 'Going Green in Lawn Care'

I have dabbled in the past with compost, but never made a huge effort to be completely green in my landscaping. Now that we have a dog, I am thinking no more RoundUp or other chemicals. I have read that I can use vinegar to kill weeds or unwanted grasses. Anyone have any other tips on keeping a lawn to "die for" without using the chemicals that may actually cause us to die?