A good read that was recently published on TechNet, that discusses the role of the Project Management Office for instance: Information Worker Competence Center - Achieving Business Success with your Collaboration Infrastructure (white paper). On a similar topic you might want to read this recently published whitepaper as well: The Project Management System Maturity Model
Competence Centers are the standard approach to managing shared business infrastructures such as Enterprise Resource Management and Business Intelligence. With the increasing importance of team and collaborative work we adopt a similar approach. Many organizations are now responding to the growing demand for collaboration by managing their infrastructure in this way. Investments in the collaboration realm are not just about the IT solution but about implementing IT-enabled change especially since “Business Value is generated by what organizations do with IT rather than by the technology itself”. This is especially valid for the latest Web 2.0 technologies providing strong bottom-up elements engaging a broad base of workers through communities, ad-hoc projects, team work and social networking.
This Whitepaper outlines the functions an Information Worker Competence Center should include and in return what contributions to business success you should expect.