Every business can use the Web to focus on their existing customers.
Include all purchases, whether in-person, over the phone, or online. Services like this help customers keep track of their preferences over time, making it easier for a company to do a better job of suggesting other products a customer might enjoy. Ask your customers for feedback and use it to better understand their needs and preferences. Create a password-protected site that enables clients to see work in progress and log their comments online. Design studios and small ad agencies, in particular, can benefit from this because it's more efficient to put the work in a central location than to E-mail or snail mail it to several different people.