Another difference lays in responsibility and accountability. In many traditional environments, the project manager is held accountable for the success of the project. Many teams operate under the "one throat to choke" rule, in which they feel it's important to have a single person that is held accountable. Agile environments operate in an environment in which the whole team is held responsible for the success or failure of the project.
In Lyssa Adkins' book, "Coaching Agile Teams," she describes the difference between a project manager and the role of an agile coach. "A project manager plans and controls, supervising throughout. A coach guides. A project manager's success equals the success of the project. An agile coach's success equals the team's continual improvement and their pursuit of high performance. The two are focused on completely different things and thus act completely differently."
For more information about the differences between traditional and agile project management styles and challenges, you may find the following content useful: Adaptation in project management through agile Software expert on Agile's rise, avoiding project management mistakes
This was first published in July 2010