Today (11/11/10) Google have introduced a bing-like preview on their google.com search results.
As you can see when you hover over a website link Google displays a preview of the website. This function is currently working in different ways on different browsers. In Chrome the preview is on all the time but in Firefox you have to click the microscope in order to see the preview.
Does this feature suggest that Google are feeling the pinch from Bing gaining more and more market share in the US search market? Time will tell whether they start introducing additional Bing-style features, for example search verticals.