We used the ground cloth this year. It really holds in the ground moisture but don't do much on the leaves. We seem to be getting enough rain not to water everyday but I would like to water if we don't get any rain for a few days if for nothing else than to moisturize the leaves of the plants. My tomatoes are the only ones that seem to be suffering.
By the way, newspapers are great to put down in between your rows of veggies. The newspaper really help to cut down on the the weeds. We are also working on planning another flower bed, trying to figure out where we want to put it. This fall, we'll plan it on the ground and then will lay down thick layers of newspaper and weigh the paper down with rock. We'll keep it that way over the winter. By spring, the weeds and grass should (SHOULD!) be pretty much dead by that point and we can work our compost into the area. And then plant.
We are also using some newspaper in our composting barrel. I'm saving the newspapers from our department and my sister is saving her newspaper for us.