I've come up with the below as the basic steps (at a very high level!) required to migrate from SCCM 2007 to SCCM 2012.
Does this look about right to you guys? Have I missed anything obvious?
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Ensure health of existing SCCM 2007 infrastructure.
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Migrate existing packages to network share.
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Update SCCM 2007 Packages with UNC path to new share.
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Check for mixed collections in SCCM 2007.
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Install SCCM 2012 Client Pre-Requisites via SCCM 2007.
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Migrate Objects.
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Test.
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Enable Advertisements.
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Migrate Boundaries.
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Upgrade SCCM Client.
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Clean up Migration Data.