Our church has been recently going through the book of James and I am working on a message on James 3:1-12 about the Weightiness of Words. I have found some great resources for this message, but also some great ways to meditate on the importance of our words. Let me encourage you to listen to the messages from the 2008 Desiring God Conference called "The Power of Words and the Wonder of God."
I think these messages could help the husband and wife who are struggling in their communication, the complementarian who is trying to speak to egalitarians, yet not doing it in a humble way, and the parents who are working on their relationship with their teenager. Our words matter. They matter to God and they matter to those around us.