I just published my first post on medium.com, a tutorial on how to get started with HTML5 extension in Photoshop.
It took me a while to find relevant info through Adobe's web of articles so thought it was worth collating in a single post. You could make some pretty cool extensions from this!
I've been to html5 conf in SF, I think that Adobe is planning to release more and more html5 products.
Cool, looks that way. Interestingly Reflow is partly written using Backbone.js and HTML/CSS etc. See the talk by Kristofer Joseph Building Reflow at http://backboneconf.com/