Google pushed the last major update of the year to Chrome, now version 16, to users. Aside from a number of bug fixes, the new version of Chrome also comes with a couple related new features: syncing across platforms and multiple user accounts within the browser.
The Google Chrome blog explains the sync feature as allowing you to save bookmarks, apps, extensions, history and other settings to your Google account and then sync it back down to other devices with Chrome. To facilitate this, they've also added a feature allowing you to sign in to your Google account right in Chrome. This will also automatically sign you into anything linked to your Google account.
This leads us to the other new feature: adding user accounts within the browser. The idea here is to keep each user's preferences separate and to easily switch between synced profiles. The blog entry makes a note of the fact that this is a convenience feature and not a security feature.
The Google Chrome blog explains more about both features and even has a nifty video. If you want to see the list of bug fixes, head over to the Google Chrome Releases Blog.