From Lunarpages Web Hosting Wiki
Mambo is a full-featured, award-winning content management system that can be used for everything from simple websites to complex corporate applications. It is used all over the world to power government portals, corporate intranets and extranets, ecommerce sites, nonprofit outreach, schools, church, and community sites. Mambo's "power in simplicity" also makes it the CMS of choice for many small businesses and personal sites.
For more Mambo help, be sure to check out http://mambo-foundation.org/.