What should be the scope of a Center of Excellence?
Should a Center of Excellence be organised around tools? Probably not. Is it better to organise them around business domains?
Is communication and project management the responsibility of a Center of Excellence?
Which parties should be involved?
Should you involve the business? How? Only via Agile projects?
According to Alan Trefler (CEO of Pega) the walls between business and IT should be taken down. Business and IT people should work daily in the same team.