when i design my sites i use to put an banner ad space on the header next to site logo but i got email from adsense who suggest me to move the banner down, closer to my main content for have better results.
I have 2 problems with that,
1. How i will add the banner closer to my content with out make the site looks ugly (the page width is around 950 and the banner 728 and left lots empty space left and right of the banner and in my eyes looks ugly). And in the other site suggest to use 336x280 who is way harder to find a way to add it.
2. What to add in the empty space on the header after i remove the banner ?