I just happened to read Tobias Meyer’s insightful article: http://agilethinking.net/essence-of-scrum.html and suppose describing the results of teams/organisations doing Scrum would be an useful addendum.
The primary benefit is significantly better productivity, but there are a handful of other important benefits(possibly even more important):
1. Focus
2. Higher possibility of building the right product
3. Speeding up learning, which increases the rate by which previous benefit is accrued.
Coming back to the topics of productivity, I’ve personally helped teams increase it in the range of 30 to 60% and am convinced that those teams can do even better. So the claims of a 200% increase in productivity by some others are not necessarily codswallop. (However I’d caution against productivity becoming the MAIN/ONLY goal of adoption.)
Chaordic Commentary 
May 10, 2012 @ 17:41:49
Some other “human” aspects of scrum: high degree of interaction within teams, people being treated as people (and not resources), flat team structure, freedom (with responsibility) to decide commitments and the like, add to the team synergy and gives tremendous motivation and satisfaction to the team members. What does this result into, for teams/organizations? Anybody can guess…
May 16, 2012 @ 09:27:51
That is true. Indeed some organisations/managers appreciate “happy” teams as a valuable outcome. These are intangible drivers of improvement (in a very holistic manner); however result in the same outcomes for organisations.