CRM 4.0 had export customizations but since the Solutions concept was introduced in CRM 2011 (and 2013) customizations are part of a solution.So you need to export a solution.
To export the default solution you can navigate to Settings -> customizations -> customize the system . This will open the default solution where you will find the 'Export Solution' ribbon button. That gives you all the customizations.
Check these
http://www.microsoft.com/en-us/dynamics/crm-customer-center/export-a-solution.aspx
http://www.microsoft.com/en-us/dynamics/crm-customer-center/import-a-solution.aspx
http://www.powerobjects.com/blog/2012/10/04/solutions-in-crm-2011-best-practices-part/
Check out this tool for Command bar customization (new area as you mentioned) http://www.develop1.net/public/page/Ribbon-Workbench-for-Dynamics-CRM-2011.aspx
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