10. Yahoo Buys Overture Services Inc.
Sale Price: $1.63 billion
In 2003, Yahoo! shelled out $1.63 billion for Overture Services inc., owners of third-string search engines AltaVista and AllTheWeb. The bid was to help Yahoo! Search in its doomed fight with Google. By 2009, it was Yahoo! that was being consolidated, as it was announced that Microsoft's Bing would be running its search operations.