This is fantastic. I've always been enticed by the idea of selling apps for mobile platforms, but I knew it would mean setting the time aside to learn either Java or Objective C with some proficiency before I could make anything worthy of sale. The ability to construct an 'app' using the same languages and tools that I use to make sites is an incredible boon.

I can't wait until selling HTML5 apps is commonplace. We have the Chrome store already, and soon we will even be able to make Windows 8 apps in HTML5 (albeit with IE9, but still!). I think a solid contender from Mozilla will also be necessary for paid HTML5 apps to become a reality. With the major browser vendors all backing this concept we have a great chance of it becoming not only a reality, but a profitable alternative to selling native apps.