Dune 2

Dune 2: The Building Of An Empire
Game controls, terrain types, buildings, units, and downloads for the PC version.
http://home.swipnet.se/~w-21656/

Dune: The Battle for Arrakis - FAQ
Detailed reference document.
http://ledmeister.com/dunexref.htm

FED2K: Dune for Sega Genesis
Includes a list of features and screen shots for the Sega Genesis version.
http://www.dune2k.com/duniverse/dunegen/

FED2K: Dune II: The Building of a Dynasty
Includes information on units, special units, structures, house Atreides, house Ordos, and house Harkonnen for the PC version.
http://www.dune2k.com/duniverse/dune2/

Nahoo
Provides tips and strategies, screenshots, cheats, and downloads. Also has a discussion forum.
http://nahoo.net/games/dune2/