JancisRobinson has a new grape book coming out at the end of the month:
Amazon:WineGrapes
I was going to pre-order it a month ago. At $125, it's a bit expensive, but the Amazon price then was not quite as painful. When I went to order it today, the price had jumped to $175 ($110 on Amazon). Yoikes.....maybe I better rethink this.
I rely a lot on RobTebeau's FringeWine WebSite for information on lesser known grape varieties:
FringeWine
Today, I happened to read his blog entry/rant on EmeraldRiesling:
Rob:EmeraldRiesling
That sealed the deal for me. I ain't ordering now.
Tom

