You can find a list of the KB articles for VMM 2012 SP1 on the TechNet Wiki. I had trouble finding some of these using the usual search engines.
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- Mapping The Virtual Networking In System Center 2012 SP1 Virtual Machine Manager
- Event: System Center 2012 Virtual Machine Manager SP1 Training
- TechEd 2013: System Center 2012 R2–Virtual Machine Manager
- MVP Book: Microsoft System Center Virtual Machine Manager 2012 Cookbook
- System Center 2012 Service Pack 1 Is On The Volume Licensing Service Center – And Ready For Production