If you've not been following it, Google recently released a new beta toolbar that has a new feature called Autolink. Currently it's mostly harmless but it's also very scary in its potential. If you click it it will scan the page you are reading and attempt to make any ISBN number, US Street Address, package tracking number or VIN number link to a book, map, tracking info or car info. A minor change and that feature could be used to make any word on the page link to something. Reading an article about Iraq? Click the Autolink button and every word on the page would link to other pages about Iraq, Oil, Saddam, etc..