Official expansion set for Diablo contains 2 new character classes, a new act, many new monster types, items, armor, weapons, an expanded horadric cube and an increases stash size.
Diablo 2 Expansion Data Collection
Printable guide containing items, skills, quests and other information on Lord of Destruction.
Diablo II: Lord of Destruction
Official site offers news, features, requirements, screenshots, and media.
HexDemon's Computer Core
Weapons database. Includes weapon details and downloads.
Misner's Diablo II
Includes information, links, downloads and character details.
Hacking programs and information for Diablo II LOD.