I've read some comments on that tool, and it seems it supports such a small featureset it's not actually that useful for modern, practical flash applications. It's targeted at banner ads and other really simple stuff.
It was featured on the BBC's 'Click' programme today, and the Chrome website has a couple of basic games created(converted) with it.
The section about Microsoft's windows 8 is the interesting bit?
"Microsoft signaled its intent to more aggressively support HTML5 with Windows 8, possibly at the expense of Silverlight,the company's Flash lookalike. And though Microsoft pledges to share more about this at its upcoming BUILD developer conference, developers have been in a tizzy over the future of Silverlight"