Some Resources

The Reality of HTML5 Game Development and Making Money from It
An article that broadly discusses the variety of technologies and standards used in HTML 5 game development. It also sheds light on the platform compatibility problems rampant in web technologies. Finally, the article explains a few ways a developer can make money from HTML 5 games.

HTML5 Game Development Tutorial
A simple tutorial for creating a simple HTML5 game. It isn't even nearly comprehensive, but it is a useful reference.

HTML5 Canvas for Absolute Beginners
A canvas tutorial from the same website as the article just above this one. Again, it's not even somewhat comprehensive, but it's a nice reference nonetheless.

HTML5 Game Dev News
A website that, as the name implies, aggregates HTML5 game development news. It isn't very browsable, but it's handy to check it every few days or so for interesting news articles.