Jeff Hanson writes:

Things companies can do from the outset to successfully map their way through a mashup:

• Discover business needs in terms of data intersections.
• Build relationships with trusted third-parties from which services, data, and UI artifacts can be shared.
• Involve sales, marketing, and executive management in the process of understanding how your organization’s mashups can be applied.
• Think in terms of flexibility, governance, and security throughout every step of the development process.
• Put into place a process for continuous evaluation and refactoring of mashup components.