Hi Mark
I have used the following resources to get familiar with SAP MII.
The link to the SAP Help Portal for SAP MII :
http://help.sap.com/saphelp_mii121/helpdata/en/44/ea42f5ee4115bbe10000000a1553f7/frameset.htm
The book that was also useful :
Implementing and Configuring SAP MII - by - Dipankar Saha and Abesh Bhattacharjee
The course that is available :
Course code - SCM380 - SAP MII - Manufacturing Integration and Intelligence Fundamental
Hope this helps.
Regards
Miss Nash Govender