u may want to check this year's Open Source CMS Award Finalists
http://www.packtpub.com/article/2007...ward-finalists
mambo is not mentioned in any of the category finalists.. if you check their site
http://mambo-foundation.org/ wala kaayo development in terms of its add-ons and plugins.. if ever naa man gani.. not quite as many as joomla and e107..
if nahan ka pang beginner na mo support og forum og gallery, i suggest e107, mas sayon.. naa na built-in forum and chatbox and active sad kaayo ilang forum support just in case u need some assistance,
www.e107.org
if gusto ka medyo advance and mas daghan og mga add-ons, u may want to check joomla (btw their developers were from the original mambo core developers, they resigned and created their own, thus now joomla),
www.joomla.org