I work for a company that have regular M&A activities and have found that the majority of our recent acquisitions are also SFDC customers. In integrating the acquired companies SFDC instance with our own we tend to make the rules up as we go (often depending on the size of the instance to be integrated).

I'd like to see some automation of this process, perhaps starting with some standard templates for data migration but ideally with some functionality/tools to allow easy integration of core data, processes, workflows etc.

I could see this being a source of competitive advantage to SFDC as well as, if our recent experience is anything to go by, ease of integration could become a selling point to CIO's of small to medium companies who see themselves as potential acquisition targets in the future.