CD-i

About.com - http://vgstrategies.about.com/games/vgstrategies/library/cdi/bl_cdi.htm?terms=cd-i
Presents cheat codes and FAQs for over 30 games.

Disctronics: CD Interactive - http://www.disctronics.co.uk/cdref/cd-rom/cd-i.htm
Offers format information including disc standards, video, and audio specifications.

The Black Moon Project - http://www.classicgaming.com/blackmoon/
Offers news, guides, reviews, forum, and scans of CD covers, magazines, and game manuals.

The CD-i Collective - http://www.geocities.com/Area51/Capsule/3570/
Provides tips, tricks, and reviews.

The Ultimate CD-i Players Page - http://www.geocities.com/Area51/Realm/2631/index.html
Includes games, hardware and links.