Some useful documents in this area :

A) Introduction to BPM

Workflow and Orchestration Solutions from SAP – Overview and Positioning

Getting Started with BPM

Business Process Management User Cases

SAP Business Workflow

B) Business Cases

BPM Vs Workflow management in SAP CRM WebClient

Real World BPM in an SAP Environment Webinar Series

BPM_and_Technology_for_your_Shared_Services_Centers___Webinars

Pactical Use Cases for SAP Netweaver BPM

NPI_with_BPM_Webinar_Shared.ppt

BPM_Webinar_SAP_EHSM_Incident_Management

Value of BPMN and RS Components Use Case

BPM Use Case at German Bottler of Coca-Cola

SAP Business Process Blueprinting for SAP SolutionManager

C ) What Gartner and Forrester say :

Business Process Management Suites (BPMS) Will Be Among the Fastest Growing Software Markets through 2011, Says Gartner

Magic quadrant for business process management suites

D) SAP Workflow Interesting Documents

SAP Business Workflow – You can use the gravity modeler – you can, you can!

BPM Vs Workflow management in SAP CRM WebClient