Last Friday MSN Search Blog posted a blog entry named New Operators Explained. In that entry they "explain" what each of the following search operators do. Operators include; Filetype:, Link: and LinkDomain:; Contains:; InURL:, InAnchor:, InTitle:, InBody: and so on.
A thread at HighRankings named Msn Linkdomain: Command Looks Hot! discusses the new linkdomain command supported over at MSN Search. One member says, "I've only run one test on it, but gee, I found backlinks I didn't know about for the site!" In all of my tests, Yahoo! still located a larger number of backlinks for my sites with the linkdomain operator. But I did not conduct a test to analyze if the results overlap between MSN and Yahoo! with that command. That would be an interesting test.