I think PGP (or GPG) is one of the most useful security software out there. However, because the existing reference implementation lacks a good interface for searching and managing public keys, PGP remains to be a tool for the geeks.
To address these issues, the PGP company is now offering a new PGP Global Directory service that will help users to search and manage their public keys. This service also supports many GPG features.
I have uploaded my public key — search for “Harry Chen” at this page.