How popular is PGP?? (Public-key cryptologo)

Hey folks, do you wonder how many companies would actually use PGP ? This page from PGP may give you an idea: http://www.pgp.com/customers/market_presence.html

Well, note that this is a page prepared by PGP (the company itself) therefore it may not be fully objective.

PGP is an advanced technology for information security. However is it user-friendly enough? Is it applicable to everyday tasks? These remained as questions I think, and differs from companies.

For you as a student, your best is to understand its advantages.