Ross Mistry (twitter) of the Silicon Valley MTC has authored this white paper:

This white paper provides prescriptive guidance and detailed steps for planning and implementing SQL Server virtualization with Windows Server 2008 R2 Hyper-V and Live Migration.  The document also communicates strategies for managing a SQL Server virtual environment with SQL Server native capabilities and System Center products such as Virtual Machine Manager (VMM) 2008 R2, Configuration Manager 2007 R2, Operations Manager 2007 R2 and Data Protection Manager 2010.

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Congratulations to Ross and his team!

Available on TechNet and as a download.