Nothinman,
As you probably know, the creator of PGP, Phil Zimmerman was an employee of NAI after they acquired PGP. He made it an important point that they release PGP source code for the obvious reasons.
However, they stopped doing so, and he left after version 7.0.3. So any version after that is arguably somewhat more suspect. In other words, he's on record as vouching for PGP while he was there.
PGP has been canned anyhow. Even though they have a version 7.5 completed that's well tested on WXP, it won't ship because they shut the division down.