Good Wine Cheap Inc.
Features tasting reviews, information about supplies, wines, and message boards.

Wines - Information
Includes information about wine history, health benefits, preparation, food pairings and where to buy.

Demystifying Wine Labels
Learn about types of wine and how to buy and order wine in a restaurant. Plus: common wine terminology and information on grape varieties.

AskMen.com: Porto Wine
Discusses the basic difference between Port wines.

Wine Scout
Offers advice on buying strategies, vintages, and where to buy French wines. Also contains tutorials, pictures of grapes, and specific recommendations.

Wineries
Search by winery/vineyard name or by location. Reviews on wineries written by consumers at Epinions.com.

Tainted Wine Causes and Reasons
Discusses topics about tainted wine.

The Wine Info Site
Includes information on grape varieties, wine regions and producers. [English, Dutch and French]