The Acumen software design blog provides you with helpful articles about Orchard CMS.

Several web sites provide a good overview.

Orchard CMS Overview

Orchard CMS Wikipedia

HOWTO: Use Vandelay in Orchard

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Orchard  There isn't any documentation for the Vendelay Industries Module used for internet marketing. This particularly affects the SEO tool for meta keywords and description. Happily there is a way around this issue and I'll detail…