Similar to top image search trends, Bing has a page for top search trends. Bing Trends page allows you to visually explore the top search trends in Bing on the current day and even for the 5 previous days from the current day. Again this feature may be new or old, available/unavailable to some countries (It works in US for sure). On the other note, I think Bing should globalize their product soon to counter Google effectively.
You can try it out here.