1. To the confidence boostersTeachers, friends or colleagues, there are those special souls who know exactly what to say at the right time. They may not even know how important that conversation was to you. Tell them in a letter. 2. To distant relativesIf your family's separated over the country or over continents, drop a line. For kin feeling cut-off, even lonely, a letter is a wonderful gift. 3. To your childhood penpalYou never know – their family may still be at the same address.