Hi, I have heard that 336x280 ads on a blog post are very good for getting clicks. But I think 468x60 look better. So which is more effective? One 336x280 ad in the post or two 468x60 ads in the post? If you want to see how it currently looks then go to http://www.monetizeguru.com
One disadvantage of the 468X60 ads is that each ad only has one spot to click, the title. On the 336X280 ads, each ad has two spots, the title and the URL.
I even have the trouble, I normally use 2 468 x 60 ads in my posts as i do not have a lot of content in each post. If you do write essays then using a square ad is much better.
in your placement i would rather use a half banner, because it looks more natural...only one link which can be blended easily...