The Privacy and Authenticity Outreach Workgroup of we.riseup.net have published an excellent list of OpenPGP Best Practices. Most Irreal readers, I trust, have already installed and configured GPG/PGP even if most of their usual correspondents haven’t.
I’ve written before that installing and setting up a default configuration of GPG is not, as often claimed by the press, difficult and that even your Mom could do it. What these best practices do is tell you what you should do after installation to make sure you’re getting as much security as possible. I learned a couple of things I didn’t know so it’s a worthwhile read even if you’re an experienced GPG/PGP user.