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

Orchard  There isn't any documentation for the Vandelay 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…