It was just annouced that 70% of all the PPC ads on MSN are now from their own Ad Center product.

Originally, last fall, MSN was running with 25% of it’s own ads against 75% of Yahoo/Overture PPC ads.    In early March, while I was at SESNY06, MSN annouced there would be an increase of traffic to 40% MSN’s ads and 60% Yahoo PPC.   Now they’re going with 70% MSN ads and 30% Yahoo PPC.   

Sometime in April, they’ll probably be showing only MSN PPC ads with no Yahoo interleave.