I've just finished setting up a website for someone - it's a responsive design under WordPress.
Some of the advertising on the page is responsive ad units from AdSense, but unfortunately other ad units are not responsive. The site owner has been given "mobile-only" and "desktop-only" ad code, but my question is, how does one even implement that effectively in a responsive design?
The only thing I can think is making a complete copy of the WordPress theme, installing it under a new name, and then using a switcher to use the "new" theme for mobile devices. Since it's a new theme, different widgets can be used, and different code added to the various needed places, but perhaps there's a cleaner solution to this?