Phantasy Star II

Crude ASCII Maps
Contains walkthroughs, item lists, and dungeon maps in both image and ASCII format.
http://www.monmouth.com/~colonel/videogames/phantasystar2/

GameFAQs
Contains walkthroughs, guides, codes, and player reviews.
http://www.gamefaqs.com/console/genesis/game/526675.html

GameWinners.com
Contains cheats, codes, hints, and FAQs.
http://www.gamewinners.com/GEN/PhantasyStar2.htm

Home of Classic RPGs - Phantasy Star II
Contains images, maps, and enemies.
http://rpg-home.lunar-net.com/psii-web/index.html

Mike's RPG Center: Manuals
Contains text-only version of the game manual.
http://mikesrpgcenter.com/manuals/genesis/phantasystar2.txt

Phantasy Star II
Contains pictures, tips, fan fiction, and commentary.
http://www.gamelegacies.com/ps2.html/

RPGamer.com
Includes walkthroughs, maps, cheats, hints, movies, screenshots, MIDIs, and artwork.
http://www.rpgamer.com/games/ps/ps2/ps2.html

RPGClassics.com
Contains illustrated character, item, enemy, and techniques lists, maps, and a walkthrough.
http://www.rpgclassics.com/shrines/genesis/ps2/

Trinixx's Pragmatic Approach to Phantasy Star II
Includes commentary on portions of the game not related to its plot.
http://www.geocities.com/trinixxofwestmarch/PS/