How do you implement affiliate banners on responsive sites - my affiliates do appear to supply responsive ads. Do poeple use 2 or more ad formats and use display:block or display:none to show the appropriate one?
Affiliate banners should resize appropriately same as any other image in responsive design. If yours aren't resizing as they should, be sure the container is not preventing it. The only banners I've seen that give resize problems are AdSense - so they only get used in footers on those sites where I've switched to responsive css.
BTW -I have noticed a definite increase (cross my fingers!) in earnings on responsive resizing sites. Don't know how long it will last but it is significant and worth the work to edit more pages. I currently only have done a few test sections to see how it goes. I have always used % width to adjust to various sizes, even back in html 4 but responsive is different and takes everything with it in downsizing.