Ah, letters...remember them? I hope you do, because even in these days of constant e-mailing and texting, there are still times when letters are the most effective form of communication with your audience or your prospects. Whether you're welcoming them, encouraging them or thanking them, letters let your audience know that you're actually taking time to communicate with them. Even in this fast-paced, quick-messaging age, letters should still be a vital part of your communications process.