Script Download: StartWorkflow.zip
http://gallery.technet.microsoft.com/scriptcenter/Start-a-Workflow-on-120bffe5
This script can start a SharePoint Designer workflow on Multiple List Items in Microsoft SharePoint Server 2010.
In a real world, you may need to start a workflow on multiple list items. It will be a heavy task if you do it manually, so you are looking for a script to complete this task.
You can find more All-In-One Script Framework script samples at http://aka.ms/onescriptingallery