What is truly great about employing responsive web design is that the website contains just a single layer of development code and database. The old way of optimizing for mobile devices was to serve an entirely different website to these devices (you may have noticed that you would be forwarded to a subdomain like m.website.com or mobile.website.com when visiting from a mobile device). With this setup, web design firms would have to write completely separate versions of a website and maintain those versions as well. Website owners would also have to change the same content on multiple versions of a website.
Responsive web design is not for every website. Owners of websites with low mobile visibility will typically elect to not spend the extra cash on something that will be rarely viewed. On the other hand, consumer goods, restaurants, and bars will definitely want to look at responsive web design to serve a user-friendly view to their mobile clientele.
You can read more in our in-depth look at responsive web design.
A few other notable changes in the site.