Responsive design is now one of the biggest considerations for any team when developing or re-developing a website. I tend to work on website refreshes — sites that typically haven’t had much work done in a while and need some restructuring to achieve proper responsiveness for mobile devices.
As someone whose website has generated over 393 million ad impressions (and counting), I know how important banner size optimization is to earning the highest revenue on your site. Tweaking ad settings and placements can easily lead to huge increases in revenue per impression, so you want to have the best information possible.
When I’m working on a website’s SEO, there’s usually a sitemap or two that have been created by default by a website plugin somewhere. But apart from the fact that they exist (sometimes), nobody has done anything further with them. And that’s a shame — because both HTML sitemaps and XML sitemaps can be hugely beneficial to both human website users and your organic search performance.