I am huge believer in typescript. This has made me consider html5 seriously for the first time.

There are still many dark spots (hello js scope, bs standards), but with Typescript I've already built stuff I could have only done AIR in the past.

I find it ironic that MSFT tried to compete with Flash with Silverlight (and failed I think), and to me, Typescript means end of the line for Flash/AS3.

The language is dead easy to pick up, and IntelliJ has been a really good IDE with it.

Highly recommended.