Man, the world of web development keeps developing. Here's another list of sites: 10 Tools & Frameworks for Responsive Design | Fuel Your Coding.
Attended the Adobe HTML5 Now and Next event at Adobe SF. Some interesting stuff coming down the pike, even if some of it is a ways off yet. Layout grids! Image filters! Application cache! Flexboxes! Someday laying out a web page won't be such a collection of kludges. The layout grids item