The Washington Post has a review of PGP 8, the newest version of the secure email messaging software. PGP was formerly a free product, but the company was bought and sold several times, and the new PGP Corp. charges $39 for the personal edition of the software.
For some perspective on this program created back in 1991, see New Architect’s recent interview of the software’s creator, Phil Zimmermann, who is a consultant with PGP Corp. The focus of the dialogue is the current state of privacy and encryption issues.