As a non-profit leader, I've been waiting for this monograph to be published for several months, and Collins did not disappoint.
In a lucid style that only Collins can deliver, he masterfully explains the subtle (but seismic) concepts of good to great for the social sector. Similar to his previous books, he effectively uses a broad array of real-life examples (e.g. the NYPD, a church, the Girl Scouts, the Cleveland Orchestra, a high school science dept), helpful graphics, and a very readable, conversational tone. Even though the monograph is only 31 pages, Collins contributes his clear thinking on numerous issues that will be very familiar to social sector leaders: how to measure success in non-$ metrics, how to recruit and motivate a passionate (and poorly-paid or unpaid) staff, how to think differently about "restricted funds," and how to transcend systemic / external / industry-wide problems. I particularly enjoyed his discussion on "legistative" leadership (versus "executive" leadership in the business world). Collins predicts a dramatic reversal - that one day non-profit leaders, who have mastered legistative leadership, will be wooed away to lead for-profit businesses.
This monograph does stand on its own. However, I think you would have to be fairly familiar with the concepts in Good to Great to fully appreciate its value.
If you are still not convinced, you can also go to his website, jimcollins.com, to read 3-4 pages of snip-its from the monograph.
Regardless, I would recommend this to every social sector leader.