Was the Holy Spirit present in the Old Testament?

Out of yesterday's sermon, I received two questions for further thought. The first was regarding the Holy Spirit's presence in the Old Testament.

The fast answer is that the presence of the Spirit in the New Testament is to be the norm because of the ascension of Jesus. Jesus has received the Spirit from the Father and has poured the Spirit out on his people (Acts 2:33). Perhaps we could say that as the Spirit was present in unique ways in the Old Testament so is the Spirit's unique presence now to be expected because of the triumph of Jesus.