Over at haligweorc we find the excellent sermon on the Trinity preached at my former parish of St Marks, Highland by the ever capable Rev. Mrs. Haligweorc. Most specifically, she takes on the fashionable Modalism we find so often preached by the Cool Kids.
Do be aware, this is serious theology being presented by a masterful theologian in a parish setting. Don't expect a whole lot of vague talk of "discipleship." This is about God, not us.