The document recommends writing letters or cards to clients as a way to stand out from other businesses that primarily communicate digitally. It suggests that handwritten notes show clients they are important and will help the writer be remembered, potentially leading to increased sales. Specifically, the document recommends sending seasonal greeting cards to make an impression without discussing business, invitation cards for client events that provide short, simple event details, and letters when launching new products to highlight major facts to follow up on later. It closes by noting letters and cards should maintain a formal tone.