MCI Communications Corp.
and MasterCard International
will be among the first sponsors of Yahoo Corp.,
the huge directory of sites on the World Wide Web that will unveil a major redesign next week. Yahoo will have five charter sponsors, each paying $20,000 per month for a three-month test period. Ads will rotate among the five most frequently visited pages on the site, but not the front page. Interactive Marketing Agency and Interactive Media Partners, both Hermosa Beach, Calif., handle.