Secured FreeBSD with USB keys and passphrase by GELI tool on ZFS using GPT only

How to setup FreeBSD 8.0R with encrypted ZFS disk based on GPT instalation. This solution include 2 kind of security based on passphrase and long random keys for AES encryption, which are extremly hard to break. More details you can find from resoruces of this post, official handbook, manpages, etc or just write a comment.

Requirments:

• FreeBSD 8.0-RELEASE (DVD ISO)
• USB pendrive