I came across a video from Burton Group with Lyn Robison discussing how silos are here to stay and looking at approaches to bridging the silos as opposed to trying to break-down the silos.
Although this video looked at silos from a technology standpoint. You could look at business silos where you could apply Service-Oriented concepts to bridge business processes gaps as well as knowledge silos where you could apply social networking concepts and solutions to assist with exposing "tribal knowledge", bringing together people with shared interests as well as mining for subject matter experts that may previously have been buried within a business unit and lost to the overall enterprise.
IT has spawned many methodologies/approaches/modelling techniques for analysing business needs from an IT-perspective, organisations have implemented/developed multiple business process improvement methodologies and each industry vertical or function may lend itself to different methodologies. The challenge for us now is to embrace the variety and bridge these methodology silos. Any ideas?