Here I've consolidated what is useful for my purposes from the excellent OpenSSL Cookbook by Ivan Ristić. Read: There is a hell of a lot more to the book than what is covered
A collection of 4 articles
An overview of DNS Certification Authority Authorization records, including the formatting and creation of.
Excellent tool for Testing TLS/SSL encryption/configuration.
Earlier in the year, I spent a fair bit of time getting our SSL (well, technically TLS, but you know what I mean) configuration up to scratch based on Qualys' SSL Labs server