Default Workflows

Workflow Resource Center
http://technet.microsoft.com/en-us/sharepoint/ff819861.aspx

More on the Default Workflows

Collect Signatures Workflow - Step by Step - http://office.microsoft.com/en-us/sharepoint-server-help/all-about-collect-signatures-workflows-HA102639357.aspx?CTT=1
Step by Step (2007) - http://office.microsoft.com/en-us/sharepoint-server-help/use-a-collect-signatures-workflow-HA010154428.aspx

Approval workflow – step by step - http://office.microsoft.com/en-us/sharepoint-designer-help/understand-approval-workflows-in-sharepoint-2010-HA101857172.aspx?CTT=1
Step by Step (2007) -  http://office.microsoft.com/en-us/sharepoint-server-help/use-an-approval-workflow-HA010154425.aspx

Three State Workflow – step by step - http://office.microsoft.com/en-us/sharepoint-server-help/use-a-three-state-workflow-HA101793530.aspx?CTT=1
Step by Step (2007) -  http://office.microsoft.com/en-us/sharepoint-server-help/use-a-three-state-workflow-HA010154431.aspx?CTT=1

Disposition Approval workflow – http://office.microsoft.com/en-us/sharepoint-designer-help/understand-approval-workflows-in-sharepoint-2010-HA101857172.aspx?CTT=1 Step by Step Step by Step (2007) - http://office.microsoft.com/en-us/sharepoint-server-help/use-a-disposition-approval-workflow-HA010154429.aspx?CTT=1

Workflow History Cleanup
http://technet.microsoft.com/en-us/library/ee662522.aspx

Workflow Management
http://technet.microsoft.com/en-us/library/ee662529