One of the free spirits I discovered at Polaner Portfolio tasting (March 24th, New York) was Clemens Busch from the lower Mosel region thanks to Mosel Wine Merchants.
Since his wines are Terroir driven he decided to break with the German labeling orthodoxy and put the individuality, the personality of each plot in his vineyard front and center.
An example of that is his 'Vom Roten Schiefer' (From Red Slate) Riesling 2006 named after the soil where it comes from. It retails for around $20.
Clemens (and his wife Rita) switched to organic methods in 1984.
He is considered as one of the best at turning off-dry rieslings where some acidity is balanced by the slight sweetness of residual sugar.
Maybe he gets that balance because he is known to hold off harvesting the grapes as long as he can.
Besides the Vom Roten Schiefer (biodynamic), I also tasted the Pündericher Marienburg Spätlese trocken 2005 (lighter to me) and the Pündericher Marienburg Fahrlay Spätlese 2005 (mostly blue slate soil).
This last was my favorite for its subtle tones.
Other organic iconoclasts: Wine Aged in Concrete Eggs at Meinklang in Austria (Return to Terroir 09)