IE9 compared to the last versions of IE is definitly a huge change to web developers.
It supports more standards than the others - and is more state of the art.
But: Those were CSS2.1 standards. The

The features implemented for usability (such as task bar integration) are rocking features - but they are necessarily needed because the favorites were not any kind of usable.

Wouldn't it be great if such standards were OpenSource instead of using a proprietary -ms vendor prefix? I mean, the heap is rising immediately for websites - depending on Apple and Microsoft.

Should we use thousands of meta-Tags to have our site compatible to all kind of operating systems? Please think about it...that's why the WHATWG was created.

Are you considering something like a "Ultra Mode" (looking at Maxthon) to support CSS3 in WebKit mode?