I’ve written a series of articles on PowerShell workflows that are appearing on the Scripting Guy blog. The first two in the series have been published at:
http://blogs.technet.com/b/heyscriptingguy/archive/2012/12/26/powershell-workflows-the-basics.aspx
http://blogs.technet.com/b/heyscriptingguy/archive/2013/01/02/powershell-workflows-restrictions.aspx
Enjoy
