AX 2012 Documentation Resources for AIF and Services - with updates for Dynamics AX 2012 R2

I've gotten a few requests recently for links to the documentation resources for AIF and services in Dynamics AX 2012. The following list is organized by type of documentation - I hope you find it useful!

White papers:

Topics on Technet and MSDN:

Training course 80416: Application Integration Framework and Services in Microsoft Dynamics® AX 2012