1. A method comprising: displaying a toolbar that persists in a browser window displayed on a device across multiple Web pages during a browsing session, the toolbar including multiple toolbar buttons, wherein displaying the toolbar comprises customizing the toolbar to display personally relevant information based, at least in part, on information other than information associated with a web page currently displaying; automatically receiving during the browsing session and without requiring user input, from a remote toolbar source independent of the multiple Web pages, an updated toolbar including a change to the multiple toolbar buttons; customizing at least a portion of the updated toolbar utilizing customization information provided by a different remote source than the remote toolbar source, the customization information comprising information that is not user-specified; and replacing, during the browsing session, at least a first portion of the toolbar in the browser window with the customized portion of the updated toolbar.