One of the implications of the Bring Your Own Device (BYOD) model is the need to deliver content to multiple devices with diverse form factors. Compatibility testing for web applications is no loner to restricted to browser / OS combinations. Can your content deliver a seamless experience to users on all the devices without having to develop multiple versions of your content? The answer is in Responsive Web Design. Mashable has rolled out an updated site that works very well on types of devices and is a great example of Responsive Web Design. Check out this article from Mashable and the Youtube video for a high level overview on Responsive Web Design.
If you would like to understand the nuts and bolts of Responsive Web Site, check out some detailed examples from Google.