As if to prove all the skeptics wrong, Dallas-based Internet food retailer Grocerworks.com apparently insists on making sure its customers get produce from the Web as high-quality as if they squeezed the little peaches and plums themselves at the store. The first time you place an order with Groceryworks.com, you get a bag of produce gratis. And after that they only deliver fresh, plump, and ripe vegetables and fruits. Go ahead, try it, the delivery staff won't even accept gratuities. "We aren't allowed to accept tips," they'll explain. "Our company doesn't want buying from us to cost any more than the grocery store."