I have been thinking about re-doing some of my adsense ads related to color and placement. Basically restructuring and moving things around. At the moment my pages return very good results in google search so I am not too ambitious about changing things. I was just wondering if anyone has ever messed up the results of a google search by moving or changing adsense around? I don't want to see a page go from top 10 to number 50 or something. I don't see that happening, but thought I'd bring the concern up. Thanks.
If you have your content in tables, yes, changing table structures can definitely make spiders read your page in a different way. I'd suggest keep it where it is.
If it's not broke, DO NOT fix it. I did some changes on one site that was doing great, cut my CTR in half. I quickly learned my lesson and put things back like they were.