Edenwines: Offers information on classifications, grapes, A.P. numbers, and regions, including maps. From a UK-based importer and retailer.
German Wine Page: Non-commercial site covering the fundamentals: labels, regions, leading producers, grape varieties, history, tasting notes. Thoughtful editorial content.
GermanWine.de: Comprehensive, general resource offers an overview of grape growing, winemaking and regions. Also lists a number of wineries.
Germanwine.net: Basic introduction to the country's wines and a gateway to a number of high-end producers; maintained by Cellars International.
GermanWineEstates: A site for the German wine lover, with tasting notes, vintage reports, reference information and photos.
Short Guide to German Wines: Schlossadler, a US importer, provides this overview of the regions and the grape varieties.
Verband der Deutschen Prädikats- und Qualitätsweingüter: The VDP is the German Wine Grower Association. Includes wineries, history, news, events, and classification information.
VinoNet: A portal to leading wineries, providing general information as well as point-of-sale material to the trade.