Information about IE8's new cross-site scripting prevention techniques

On MSDN Blogs, there's a new article about Internet Explorer 8's forth-coming features. This time, the blog talks about cross-site scripting (XSS) and the prevention of such attacks automatically.

Sounds good to me to have such prevention built-in. However, the detection algortihm must be good as not to prevent web applications from working normally. However, I believe this to be not a big issue in any case.