Create Workflow in SharePoint Designer 2010. - The workflow is created to Approve or Reject new products according to thier selling price.
See the Video @ Create Workflow with SharePoint Designer 2010
Creating Workflow using Visual Studio 2010 – The workflow in the below video will be a Site Workflow which can be run one time to approve\reject all the products in the products list which has selling price more $4000.See the Video @ Creating Workflow using Visual Studio 2010
Creating Workflow Initiation form - This video will help you create a Initiation form for the above created Visual studio Workflow, so that user can manually enter the selling price (which was $4000 in above video )with which the products in the SharePoint list are compared for approval.See the Video @ Creating Workflow Initiation form for SharePoint 2010 Workflow
Creating Event handlers for Workflow - In this Video you will learn how to create Handlers for the Workflow. You will then be able to run code on various workflow events like Workflow Initialized or Completed. See the Video @ Create Handlers for SharePoint 2010 Workflow
Create SharePoint 2010 Workflow in Visio - In this Video you will learn how to Create Workflows in Visio using Visio SharePoint Template and then export it to SharePoint designer 2010.See the Video @ Create SharePoint 2010 Workflows in Visio 2010
also see : SharePoint 2010 Workflow Interview Questions