The benefits of working with Application Service Providers can be compelling -- faster rollouts, lower costs, less time spent on implementation and maintenance, and a greater opportunity to focus on your organization's core competencies.
To come up to speed in a new position within an ASP, I bought three books on the subject. This one is the most clearly written of the three, and would be useful to anyone newly employed by an ASP, or a professional responsible for making decisions on using an ASP.