From MSN Search's WebLog - New Operators Explained:
"We shipped 1.0 with the Link: keyword, which allows you to find pages that link to a single page, ala link:search.msn.com."
When you actually perform that search to see who links to MSN Search, the very first listing is for Viagra (or is that an ad? I can't even tell). And down at seventh is search.microsoft.com. It's nice that they've introduced the "link" operator, but for now, Google and Yahoo are better at it.
The same search on Google actually returns a list of sites that make sense. Yahoo's search is pretty darn good too: "link:http://search.msn.com/".
Nice to see the competition on the search front, but it feels like MSN's got a ways to go.