Interesting! I've been using Bing for several years and that "did you mean?" ala Google, or "we're including" Bing has been there. Running FF3x with NoScript (regular), IE 8, IE9beta and shows in all. What results do you get for "santandore" (include quotes in search)? Drill down on Bing, for me, seems more straightforward and generally accepted practice than on Giggle.
"We're including results for santander. Do you want results only for Santandore?"
That's right below the tabs on the new interface for me ... It stood out a bit more on the older interface, but as far as I remember it's always been there on both for me when they switch up my results.
When I do it it says above the results "Were you looking for Santander?" but it provides no way of rejecting this and telling it that you wanted Santandore. It does not seem to be able to find the almost 10K Santandore results that Google finds.