Backlash's MtG Site - Includes trading, decks, and links.

Searchable Online MtG Database - Allows users to search with card title, color, edition, type, and text. All records are cross-linked for searching.

Marvel Magic - Fantasy card sets of the Marvel and DC Universes.

The Gathering - Articles, decks and lots to read for beginners. Updated frequently.

Crystal Keep - MtG collected lists and rulings. Has rulings summaries that are up-to-date. They have been published monthly since January 1994.

Magic Card Scans - Scans of all of the cards in the sets of Beta, Arabian Nights, Antiquities, Exodus, Mirage, Visions, Nemesis, Legends, Urza's Saga, Tempest, and others.

MTG2k - Apprentice League, card tips, strategies, general tips, and downloads.