I mulch about half of the clipping but I tend to put around most of my clients gardens. This helps with weed control and creating better OM (Organic Matter) for their gardens in the future. I only do this in early Spring for several of my clients as not everyone has gardens. So only about 1/8 of the clippings go to this and the rest that is not mulched go into wooded areas as the grass clippings work as food for most of the wooded areas.
If the client does not want it bagged i mulch it up right there on their lawns. Starting to get more clients wanting that. I can see MORE of my clients wanting that this year because of our great storm Sandy.