Sharepoint 2012

http://www.amazon.co.uk/gp/cart/view.html

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http://sharepoint.microsoft.com/Blogs/GetThePoint/Lists/Posts/Post.aspx?ID=420

http://www.slideshare.net/RBAConsulting/sharepoint-2010-workflow-university-slide-deck

http://msdn.microsoft.com/en-us/sharepoint/ee513154.aspx

http://www.nintex.com/en-US/Products/Pages/NintexWorkflow2010.aspx

http://store.bamboosolutions.com/sharepoint-workflow-conductor.aspx?gclid=CMPA08ernrECFYcntAodzBol7g