Easy to remember principles of governance are ilustrated by Gartner:
IT governance addresses two major topics: demand governance (“doing the right things”)
and supply-side governance (“doing things right”).
PS: for more staff for IT governance refer to an elaier post http://daniyar-tech.blogspot.ch/2012/12/it-governance-explained-to-business.html and http://daniyar-tech.blogspot.ch/2012/12/business-management-of-it.html
PPS: there is an interesting analysis on centralised vs decentalised model - refer to Figure 5 in this document