I don't think I am going to bother with MSN's new adCenter. It's bad enough I have to deal with two confusing poorly designed ad systems. So, I don't think I will be adding a third. I am not sure it's going to be worth the hassle considering MSN trails Google and Yahoo in the amount of traffic they drive.
Here is a free idea for Microsoft. Sell MSN to Google or Yahoo and focus on shipping an Operating System that works and is on time.