I recently started messing with
Mambo Hosting and find it good, though euk may have pointed out some security issues with it ???? Its really good, easy to work with. Can be installed from Cpanel.
All the documentation can be found here
Mambo - open source content management system &
Mambo - A PHP & MySQL Content Management System.
For templates this web site hosting is well worth the minimal fee
Mambodesign - Mambo Templates, Free Mambo Templates, Mambo Resources - Home