From Ahbijit Kadle at Upside Learning.  

When writing the whitepaper about Casual games, I did a fair bit of research and looked at several hundred web links. While doing so, I documented a few of the better ones. I’d been mulling posting these to the blog. So here they are - a Top 100 Learning Game Resource list. If you are already developing learning games, these links will broaden your horizons, as they did mine. If you are contemplating beginning – it might help to look at links that interest you to get some grounding ideas.

This list isn’t categorized in any way, and it’ll stay that way until I figure out a good way to tag and qualify them in some way. Most often such a list brings up debate about the quality of content linked to. In putting this list together, I worked with Tony Karrer and his eLearning Learning site extensively to match links that are popular based on social signals, specifically in the Games and Simulation categories.  Click here for his full article.