BPMN or Business Process Model and Notation is becoming a standard in both graphically depicting and modeling business processes for the purpose of automation. Below important are some key resources to assist you in this topic area.
A word of caution and a key thing to consider when modeling using BPMN: There have been several versions of the standard and while the latest version of the standard, (2.0) is supported by many process mapping and modeling tools, many of the full BPMS execution engines do not, and cannot execute all elements of BPMN 2.0 models nor can they import/export them. So, if your utlimate intended use of the model is for execution by a BPMS automation tool, you may wish to consider using an earlier version of the standard or verify your target BPMS vendor can support 2.0.
BPMN Video Tutorials For Beginners
6.4 Minute Video Tour...
from BPM Resource Center
Short video covers the basic concepts and elements of BPMN
BPMN Video Tutorials Advanced
BPMN Gateways Video - this video provides a detailed look at BPM Gateways and uses them in an example.
More advanced videos coming soon.
On-line Guides and Tutorials
BPMN 2.0 On-line Modeling/Tutorial Guide - This is a BPMN tutorial for begginers.
PDF paper on BPMN 2.0 Modeling - A tutorial provided with examples by OMG
BPMN Guide from IBM
BPMN Events - examples of using BPMN Events
Other Resources
Real Life BPMN - Popular german book - now available in English.