SharePoint 2010 Ribbon Customization - controls and commands deploymen

One of the most valuable interface changes provided in SharePoint 2010 is the new Ribbon. This contextual interface allows users to execute any action related to ribbon controls depending upon the context the user is currently dealing with. The SharePoint 2010 API allows developers to extend and customize the ribbon using SharePoint features on site/site collection level. This article shows the way how to do that.