Searchable glossary provides information about hundreds of types of grapes. Also contains vintage charts and tasting note terminology.

Offers information about 144 varieties organized in an interactive table. Also sells a print version of the table.

Features news and information about Viognier, a wine of the month, and a searchable database of retailers and prices.

Information includes wine styles, characteristic flavors, and vinification methods.

Searchable collection of links, including grape variety and viticulture resources.

Industry organization dedicated to promoting the Petite Sirah grape. Includes a history of Petite Sirah, articles, a list of members, and recipes of suggested food pairings.

Association promoting South Africa's Pinotage. Contains a history of the grape, winemaking information, and a producer list.

Cyber club for fans of the Pinotage grape of South Africa. Includes information about the grape, a newsletter, links, and membership details.

Focuses on Sonoma County Zinfandel. Includes links to information about the grape, tasting notes, and a list of wineries.

Searchable database with very technical information and some pictures.

Information about varieties suited for cool climates.

Non-profit organization dedicated to promoting Zinfandel. Contains information about the grape, membership details, and a list of events.

Contains tasting notes and links to Zinfandel-producing wineries.