I've just submitted my essay on What is the Centre of NT Theology? for my NT Introduction module. I slated mono-centric proposals, arguing that the narrative nature of salvation-history demands a multi-centric approach (a molecular rather than a nuclear model). I proposed a narrative approach to NT Theology as the way forward (not quite an original idea) and also had the temerity to propose that the overarching paradigm for New Testament Theology was likely to be the Kingdom of God. If you are bored, you might want to comment on this (but you might have better things to do...).