The unified menu which received a lot of heat from dev channel users has now been pushed. The change makes sense when you consider Google's commitment to keeping Chrome's interface as minimalist as possible, but it does mean that certain functions aren't located in the places users expect to find them (like the Extensions link).
More notes are available on the official release post, and you can also check out the Chrome Blog's thoughts on the update.
Looking for the Google Chrome beta channel download? Why, it's right over here!