To update to the latest stable version of Chrome, simply close your browser and re-open it -- the update should be applied automatically. Alternatively, click the wrench icon and then About Google Chrome, which will check for the the latest update.
It's Chrome's second birthday today, and in addition to posting some fancy-schmancy images to celebrate Google Chrome's stable channel has been bumped to version 6. For those of you still keeping tabs on version changes, it's only been four months since Chrome 5 went stable.
The update means that all Chrome users can now take advantage of extension and autofill sync -- both important parts of Google's desire to keep your 'browsing platform' uniform across all the computers you use.
No announcement yet from the Chrome Blog, but we'll add a link once their official post has gone live. In the meantime, the Chromium blog has a breakdown of some of the more important security updates and feature additions.