MSN is trying to breath life into their maps product by using celebrity endorsements for their favorite locations. They probably would have got some good buzz with it if they could have got Paris Hilton to sign up.
Some of their features, like adding push pins, are pretty useful. A shame that you need to login to their system to send that information to anyone / make the feature useful. That required login shit and lack of support for other browsers / systems will be the thing that ensures the death of Microsoft.