Sharepoint 2010 Workflows

http://office.microsoft.com/en-us/sharepoint-designer-help/introduction-to-designing-and-customizing-workflows-HA101859249.aspx

http://social.technet.microsoft.com/Forums/en/sharepoint2010customization/thread/44cd77df-4645-4b4b-8071-c391d6a4f27d

http://social.msdn.microsoft.com/Forums/en-us/sharepointworkflow/thread/22f6a3c9-a956-4741-8507-917c3dcef67e

http://social.msdn.microsoft.com/Forums/en-US/sharepointworkflow/thread/afb74b86-8486-4406-bafa-539353e8aae5