This Mambo Component allows you to create an Unlimited number of Custom Menus for use on your site. Your MyMenus will have all of the same functionality as the Main & User Menus built into Mambo. The component creates a Module for each MyMenu you create, which can then be published and placed in any available module area.

UPDATE:
Robert and the Mambo team have added MyMenu into the core of Mambo 4.5.1 so there is no need to download my component unless you are running an older version.