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If you have too many ads, and not enough content close to the top of your page (ie. you have to scroll down to read the content), you can expect to have a drop in search engine ranking.
Anon Adsense Client: Is there any way you guys at Google can force content providers to place fewer ads and have them lower on their web pages?
Google Support: We're about to implement our enhanced search algorithm that will do just that.
Anon Adsense Client: You guys are geniuses! Will there be a price increase for this wonderful service.
Google Support: (in Curly voice) Certainly!