M$ deserves some credit for supporting CSS long before other browsers did, as well as AJAX. But launching IE8 without canvas, border-radius, and web fonts is pretty sad.
It is my understanding (which may be incorrect) that -moz and -webkit is the way that it's supposed to be done, in compliance with standards. See vendor specific keywords here:
The idea is that by identifying them with a specific browser, new features can be tested by vendors first before moving into the main standard. This is much, much better than some sort of 'silent extension' where one browser treats some type of tag as different without being explicit about it being for one particular browser.
I think blhack is referring to the -moz-border-radius selector that only works in Firefox. One could use the CSS3 selector, border-radius, but that is not in the article.
