Ken Schwaber, one of the two developers of Scrum (the site has recently been updated, so go check it out), has an interview on ITConversations:
You Thought it was Easy: Wrestling Gold from Today's Software Projects
The benefits of Agile are many, the implementation is easy, and the problems are daunting. Ken Schwaber, Senior Consultant, Cutter Consortium & Chairman of the Agile Alliance, discusses the obstacles to wresting the gold from today's software projects.