Amazon.com just posted my five star review of PGP & GPG by Michael Lucas, one of the best tech authors around. From the review:
PGP & GPG is another excellent book by Michael Lucas. I thoroughly enjoyed his other books due to their content and style. PGP & GPG continues in this fine tradition. If you are trying to learn how to use PGP or GPG, or at least want to ensure you are using them properly, read PGP & GPG.
Note: Is anyone using GnuPG with a smart card like this one from Kernel Concepts?