"Making the web faster continues to be our main area of focus. Thanks to a new version of WebKit and an update to our JavaScript engine, V8, interactive web pages will run even faster. We've also made sure that JavaScript keeps running fast even when you have lots of tabs open," reveals Google Chrome's blog.
Google's own benchmark shows that the new version runs 30% faster than Chrome 1.0, but it's probably a better idea to test the application for yourself.
Version numbers are not important and you don't even need to know that the browser has been updated: since it always runs the most current version, the new features are enabled gradually as they're developed, like in a web application. "A note on version numbers: we're referring to this as Chrome 2, but that's mainly a metric to help us keep track of changes internally. We don't give too much weight to version numbers and will continue to roll out useful updates as often as possible."