Browser settings are now opened in their own tab, as opposed to a separate window. The added space and cleaner layout that this provides is actually quite nice, and when you think about it, a browser that can use multiple tabs really has no reason to make new windows at all, so it just makes sense. One cool side-effect of moving settings into a tab is that they're actually browsable, meaning that if you get good enough at it, you can go directly to the page for certain settings just by using its address -- like "chrome://settings/advanced" or "chrome://settings/browser."
Passwords have been added to the ever-growing syncing list, out-dated plugins are now disabled by default, built-in malware reporting bolsters day-to-day security concerns, and Web apps can now be backgrounded when not in use (don't worry, it's done automatically). As usual, beta channel users can grab this update simply by restarting their browser, while everyone else can get it by going to the beta channel landing page.