Major League Soccer has quietly implemented a major cross-marketing effort with the National Realtors Association. From here on out, Major League Soccer will help market the NRA's "Mulitple Listing Service" by putting the initials MLS on most of its materials, in stadiums and on its broadcasts. Meanwhile, The Realtors have agreed to help spread the word about Major League Soccer by putting the initials MLS in the windows of thousands of realty offices across the country. This could be big. I've already seen it in effect as I visited a couple realtors this week.