He has the zeal of an evangelist. He's travelling the world in search of converts. His passion knows few bounds. It's Tyson Stelzer - he's not after your soul, but instead earnestly desires to convert you to the object of his zeal - the screwcap. The message has now reached South Africa, and a pdf file of his presentation at a screwcap rally is here. I quote:

I put this challenge to you: I would like to see every bottle of 2008 South African Chenin Blanc screw-capped. Every bottle. Young, fresh styles, oaked styles and sweet styles. Domestic markets, export markets – every export market, every bottle. Every single bottle of 2008 South African Chenin Blanc. Australia did it with Riesling in 2000, Marlborough did it with Sauvignon Blanc in 2001. Now it’s South Africa’s turn to take the baton. Treat this as a challenge for getting every producer on side. Every producer. And then springboard off it to tackle your top reds in 2009.

It is not reported whether the winemakers came forwards weeping to pledge their wines to screwcap, or sat there wondering, 'who is this patronising w****r?' Personally, I think Tyson has left the path of reason a little by aligning himself with a single alternative closure type, when several alternatives to natural cork are now on the market, many of which don't present the extreme technical challenges that working with a very low oxygen transmission closure such as a tin-lined screwcap does.