Can someone give me an idea of how effective MSN adCenter is compared to Google and Yahoo products? I would appreciate someone who has developed and managed several campaigns in each. Thanks.
All the information you need is freely available here, on other forums and through a simple Google search. I don't think anyone is going to sit here and type up a Qualitative Analysis for you.
It's difficult to tell the defernece because they both huges companies that probably would have the same most profitable system that exists.