According to
Electronista, Google Chrome 16 syncs, shares multiple accounts. Google has posted its beta release for Chrome 16 with a view to tackling multi-user computers. The browser can now take on multiple Google accounts, each with their own syncing intact. The simple change lets a family or guests get access to all their bookmarks, themes, and web apps without the regular user having to sign out or change the user account in their OS.
http://www.google.com/landing/chrome/beta/UserAgent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-US; rv:1.9.2.23) Gecko/20110920 AlexaToolbar/alxf-2.14 Firefox/3.6.23