MSN has launched its Ads Centre

There is much speculation in the industry what market share MSN will take with the launch of the Ads centre.

Microsoft have set up a blog so they can add comments/communications about the launch and new service

So far they have tested the ads center with some leading companies in the UK. So far the test has been a success (hence the rollout). If you go to MSN the PPC feed is still Yahoo - so I'dimagine they'd be phasing out Yahoo in the coming months as they get new vendors onboard.