Posted 26 November 2011 - 12:39 AM
That's a customization of the post with the ad aligned right. A content sidebar would not really apply. You can also add code directly to the post when you write it, making sure the alignment is set to the right.
I'm not sure how comfortable you are with coding, but effectively, you could edit the template.content.php or template.postloop.php files and place the ad there. Each time you create a page, the ad would be built in. Are you familiar with editing the template files?