Up till now, it seems that adding a 3rd party ad-code in a side bar (like adsense 300×250 for example) does not work well with responsive themes. I’ve contacted almost all responsive theme authors here with this pre-sale question, and the answer below is the most clear to me (as I’m not that technical):
The code from most of the 3rd party ad services doesn’t scale and resize because it is served as separate content in an iframe container. The theme can adjust the size of the iframe, but it doesn’t control what happens inside of the frame. Responsive web design has exploded in recent months, so I’m sure the ad services will offer some type of solution soon (they are already exploring options http://blog.buysellads.com/2012/01/adaptive-web-design-advertising/)
Is that the overall conclusion? If so, I’ll have to wait till there’s a solution for this matter. If anyone has one right now, it would be much appreciated.. Thanks in advance!