I separated my adsense and infolinks ad into two different sites. My wordpress blog runs the infolinks ads then my blogger blog runs the adsense ads.
I did it because I thought it may confused visitors where to click ads. Another is that Google might control the traffic or rankings in the search engine if the site has other ad system running. They will prioritize their product first, and that is google adsense. Control freak? Manipulation? This is a ridiculous observation.
I've been testing for a month now but seems there a no changes in the ad earnings. This post is a crazy one! Anyway we'll never know if you don't try it.