A Bing Community thread has one webmaster asking why is he getting traffic from http://www.bing.com/spresults.aspx?
Brett Young from Microsoft's Bing Team came in to explain that the traffic seen coming from http://www.bing.com/spresults.aspx is actually from the Internet Explorer (IE) version 6 search pane or search box.
It is used for the IE6 search pane. I'm thinking the traffic is legitimate.
So if you see this traffic, it may be coming from a really old and outdated browser.
Forum discussion at Bing Community.