There's a nice blog entry on it here: http://www.singlehop.com/blog/binary-vivisection-part-1/
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While looking over the changelog and documentation, I realized that there doesn’t really seem to be a good tutorial or primer for getting familiar with the Vivisect framework so hopefully we can remediate that today. In this series, we’ll be covering the usage of VDB (dynamic debugging component) and vivisect (static analysis tool).
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You can also see the README file here, and some related scripts here.