GPGTools claims to be an easy to handle solution for OpenPGP on Mac OS X. It gathers relevant tools to integrate privat key encryption into your workflow.
GPGTools
is a project that bundles OpenPGP apps for OS X. The installer combines the tools
GPG key-chain access to manage your keys,
GPGMail for handling of PGP mails in Apple Mail,
MacGPG2 to install and access the underlying cryptographic apps,
GPGServices for working with plain text files and the copy-paste buffer.
All of these are originally supported by the GPGTools team.