I've seen this idea written about in blog posts and in comments on this blog. Many times the concept of Spirit vs. word is brought up to say that certain NT passages (usually in the epistles) do not apply to us today. Especially in the area of women's roles in the church, passages such as I Corinthians 12-14 and I Timothy 2 are discounted as not being directed at us because we are in the Spirit.
One passage that is often abused by those who espouse a Spirit vs. word approach is II Corinthians 3:5-6. Paul writes, "Not that we are sufficient in ourselves to claim anything as coming from us, but our sufficiency is from God, who has made us sufficient to be ministers of a new covenant, not of the letter but of the Spirit. For the letter kills, but the Spirit gives life."
These folks point to the final sentence in particular. They say that it is the Holy Spirit who gives life (I agree with this). They then make the leap to saying that parts of the NT are the letter which kills (with this I disagree). Interestingly, they seem to pick and choose which parts of the NT are the letter that kills, for they never reject all of the NT.
The big problem with their use of II Corinthians 3 in this way is that they are ignoring context. In 3:3 Paul writes, "And you show that you are a letter from Christ delivered by us, written not with ink but with the Spirit of the living God, not on tablets of stone but on tablets of human hearts." In 3:7-8 we read, "Now if the ministry of death, carved in letters on stone, came with such glory that the Israelites could not gaze at Moses' face because of its glory, which was being brought to an end, will not the ministry of the Spirit have even more glory?" Please note that in both 3:3 and 3:7-8 Paul mentions writing on stone. This refers to the Ten Commandments specifically and the OT law in general. Therefore, when Paul talks about the letter that kills he is discussing the OT law, not the letters of the NT.
Additionally, it is absurd to think that the God who inspired the writings of the NT would have his Spirit contradict them and encourage us to disobey them. II Timothy 3:16 says, "All Scripture is breathed out by God and profitable for teaching, for reproof, for correction, and for training in righteousness." If we think that God inspired the NT but that the Spirit contradicts the NT, then we don't have a biblical understanding of the Trinity.
The truth is that no contradiction exists between Spirit and word. They always agree. The Spirit can certainly tell us to do things not addressed in scripture. However, he will never lead us to do anything that flies in the face of scripture.
Spirit vs. word does not exist in the mind of God. It should not exist in the mind of his church either.