I am amazed at what can be done with HTML5 canvas (take bespin or google wave as examples). It seems it is a revolutionary approach which really leverages widespread standards and technologies (html, javascript and css) and pushes them to a new level.
It seems that HTML5 is a very strong contender for RIA solutions with strong points in portability, openness, available tools, and future userbase.
So what are resources, documentation, tutorials, references would you recommend to get feet wet and start making something cool in HTML5?