We have posted a write-up that talks about what gpgAuth is and how it works.  You can visit it here: http://www.gpgauth.com/#what_how

We are working on getting a writeup that explains how to implement it. It should be available sometime Monday, June 25th, 2007.

The forums are open now as well, so feel free to ask some questions.

The gpgAuth Team - www.gpgauth.com