Are the Psalms Trinitarian?

One of the recent criticisms I have heard of the heavy or exclusive use of psalmody in worship is that Christ's name is not mentioned therein, nor is the doctrine of the Trinity explicitly found. Men who I know and respect have said this, and I have recently heard the same over at Reformation21. Here's a great article, arguing that the Psalms are rather a place where God the Three-in-One is explicitly praised, and with Biblical emphasis.