Mambo team splits over foundation, IP concerns
OpenSourceMatters: Mambo Open Source Development Team - Letter to the community (via /.)
I'm not a fan of Mambo, but I think it's great the developers are doing the right thing. Contrast with the Plone Foundation, which IMHO, was done right. That's not to say it was done perfectly, or that there aren't issues or that everyone in the Plone community agrees with every goal of the Foundation, but by and large, the founders, almost all developers, had the right interests at heart.
I wish the new Mambo team all the best!