I had a great time presenting the Windows PowerShell 3.0 Workflows topic at the @PSBug meet yesterday! This was a level 100 session on introducing PowerShell Workflows and gave me an insight into what exactly the beginners are looking for. Thanks to the participants for making it interactive.
Here is the deck I used for the session! This is an abstracted version and may not give you a complete overview by itself. But, you can use this as a good starting point.