Andrew Schultz's Page: Offers maps, FAQs, walkthrough, and lists of hirelings and bugs.
CheatBook: Describes changing savegames with a hexeditor.
Rapier's Chamber: Offers walkthrough, scanned map of Cron and running instructions.
RPGClassics Shrine: Offers maps, walkthrough and a wide array of lists and hints.
Sorpigal: The Might and Magic Resource: Offers description and scanned map of Cron.
The Video Game Museum: Offers screen shots of the Sega Genesis version.