Madeira Wine Guide: Non-commercial provider of information about Madeira's history, styles, grape varieties, producers, vintages, and winemaking.
Port Wine Appreciation Pages: In-depth information on the production, storage, cellaring, serving etiquette and enjoyment of Port. Includes producer and vintage commentary.
Port Wine Institute: Official resource includes history, viticulture, standards, and directories of bottlers and traders.
The Vintage Port Guide: A personal guide to Port. Includes tips on storing and drinking, tasting notes and general information.
The Vintage Port Site: Extensive information on Vintage Port, including history, serving tips, discussion forums, and a vintage database. From the Symington group of Port producers.