Responsive Web Design

As the number of web-enabled devices continues to grow – each with differing capabilities and features – it's no longer sensible to build fixed-width websites. Now, with smartphones and tablets thrown into the mix, it's clear that our traditional methods are no longer applicable. Thankfully, responsive web design combines fluid layouts, flexible images and media queries to help us build sites that gracefully adapt to any environment they encounter.

In addition, responsive web design breaks down into 4 fundamental categories:

Targeted Screen Resolutions:

Mobile Testing Tools:

Articles:

Smashing Magazine

SitePoint

Videos: