Webmasters, if you have an online gambling related site that is content (original!) rich and spam free, we'd love to hear from you for a link exchange.  Just send an email to iigambling @ gmail.com

Wiki's Online Gambling Page - Nice introduction to the online gambling industry with a nice overview of key players, issues and history.

Dmoz Online Gambling Guides -  Human edited listing of content rich relevant online gambling sites.

Wizard of Odds - If you're seriously into game maths or want to learn the odds of winning certain games or game strategy, this is a great place to start.