Brian Fehdrau Interview -- An informal sit-down with the lead programmer.
Concept Art on icysugarspike's Blog -- An outstanding showcase of original concept art.
Fan Art on DeviantART -- Has some pretty cool illustrations.
OST on YouTube -- Secret of Evermore's fantastic soundtrack.
Fan Site by Mana Knight -- Detailed statistics for alchemy, weapons, armor, monsters, etc.
GameFaqs -- A still-active forum and good repository of information.
Wikipedia Page -- A concise overview and some background.