JavaScript
@adnim
"If a human cannot measure the time difference between a page rendered in different browsers wtf does it matter, Google stfu."
This is mistaken - as well as boorishly ill-mannered. (STFU, indeed!).
Microsoft would like people to think the appearance of a static page from a cache is what counts - hence the recent false claims about the speed of IE. (It's actually painfully slow in use compared to the alternatives - which is precisely why they're trying to throw sand in the public face in the hope that people don't realize that.)
Deliberate misrepresentation from MS - hence the accompanying avatar.
What's important about Chrome and the Safari beta is the speed of the JavaScript engines. The latest Firefox 3 betas seem to be catching up, too.
Three different JavaScript benchmarks here - including SunSpider:
http://www.maximumpc.com/article/features/browser_brouhaha_your_maximum_guide_browsers_today_and_tomorrow?page=0%2C6
What this means is that you could be twiddling your thumbs while you wait for Internet Explorer to respond when you're not loading a static page from the cache but actually USING a JavaScript-heavy web application.