My blog. http://www.nleastchatter.com/realdirtymets
has an issue with the banners above and in between post. The ads do not shrink when a lower resolution is used. The post box does but the ads stretch into the side bar or push it down where there is no content on the side bar.
3rd party ads can’t be resized, and this is a good reason to use a fixed width theme instead of a fluid width one like yours. Your theme could be converted to a fixed width one, but it would require css editing (in style.css).