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Many times you will find that the out of the box workflows are not sufficient to meet your requirements. You may need to modify the out of the box workflows or at times even create workflows from scratch. The easiest way to do this is to create or modify workflows in SharePoint Designer 2010.
You could not modify the out of the box workflows in SharePoint 2007. In SharePoint 2010 you can modify some of the out of the box workflows.
In SharePoint 2007 workflows created in SharePoint Designer could not be exported and reused. This is now possible in SharePoint 2010 in the form of reusable workflows.
In this example you modify the out of the box approval workflow. The approval workflow routes a document for approval. Approvers can approve or reject the document. You customize the approval workflow to move the approved documents to another list.