As previously promised, Google in progress to test multiple profiles for Google Chrome. It's a Chrome OS feature that's now obtainable in Chrome's Canary builds and Chromium. Just enter about:flags in the address bar, enable "Multiple profiles" and click "Re launch browser" at the bottom of the page.
The new feature connections each window with a profile and lets you sync some of the settings with a Google account. Until now, you could create new profiles physically, but you had to use special shortcuts for each profile (Chrome has briefly added support for multiple profiles in the interface back in 2009, but it was quickly dropped). This feature is now available in the interface, even though it's more incomplete and you can only recognize profiles using Google accounts.
"The multiple profiles feature will allow the user to connect a profile with a specific set of browser windows, rather than with an entire running example of Chrome. Allowing different windows to run as different Chrome identities means that a user can have different open windows connected with different Google accounts, and correspondingly different sets of preferences, apps, bookmarks, and so on -- all those elements which are jump to a specific user's identity. Having multiple profiles in the Chrome browser also makes it easy to browse with divide identities without having to log in as separate users at the operating system level," explains a Google Chrome intend document.