The new browser has plenty of these soon-to-be-ubiquitous features, such as the ability to bookmark a page with a single click and the "Smart Location Bar" that uses the browser's URL field to help users rifle through their bookmarks and browsing history.
After restarting your browser the plug-in will display a people map in the sidebar - just use the view menu to switch that back to history or bookmarks if you want to.
A9 will also centrally store your bookmarks, previous searches and browse history, which is useful as that means you can access them from other computers, but also means that you need to be careful that you do not unwittingly leave important personal information about yourself on other people's computers.