Fr. Cantalamessa's recent homily on faith in the Trinity. If you haven't read it, I highly recommend it--good stuff.
One of the things I love about Pope Benedict's theology is that it is faith-filled, and he makes a point of being explicit about that (for instance, in Jesus of Nazareth). Clearly, Cantalamessa (the pope's household preacher) is of the same ilk--not a coincidence I'm sure. This is the guy the pope asks to preach for him--heady stuff. :)
I also recommend reading Fr. C's first homily for lent on faith in the divinity of Christ, if you haven't already.