Since nailer's comment on my other post can't be directly replied to.

From googles mouth

http://googleblog.blogspot.com/2011/02/microsofts-bing-uses-...

"We gave 20 of our engineers laptops with a fresh install of Microsoft Windows running Internet Explorer 8 with Bing Toolbar installed. As part of the install process, we opted in to the “Suggested Sites” feature of IE8, and we accepted the default options for the Bing Toolbar.

We asked these engineers to enter the synthetic queries into the search box on the Google home page, and click on the results"

In all honesty I'm a bit wrong as they did say they used the google box on the page.