Green mulch?

So spring is here, and you hear the lawn mowers buzzing and keeping the lawns looking presentable.  Now I wish I could say that we use a push reel mower, but with 1.5 acres it would be quite a workout.  We do however, collect our grass clippings and use them as mulch under trees, in areas that need weed control, and in our compost.  It's the perfect use for grass clippings instead of trashing them (people really do pay to throw away good mulch?!)