Impressive and well written piece on the key grape in Port production. I have enjoyed a few single grape bottlings of Touriga Nacional from a variety of vintages by Quinta do Crasto that uses this particular grape in non-fortified Douro red wine. If you have not tried one, seek out the '96, 2001 or 2003. I appreciate your work here and hope you will include other grapes that cross the borders of our Iberian wine partners, Spain and Portugal such as Tempranillo/Tinta Roriz.