SVG is a big deal. It seems to me like its becoming a bigger deal, at least, I’m running into it more often. The trend toward responsive design is probably at the root of this push. SVG allows for fantastic scalability and the source code behind the images is actually xml and editable. I ran into Steven Bradley’s blog vanseodesign.com a few weeks ago and have really profited from his tutorials on SVG. If you’re looking for a good starting point I would recommend you start here and follow along. He has a great writing style and his examples are understandable.