Responsive Images: Use Cases and Documented Code Snippets to Get You Started
When to use
Responsive Images: If you’re just changing resolutions, use srcset.
Don’t use
Native Responsive Images
Built-in Browser Support for Responsive Images
To Picturefill, or not to Picturefill
Responsive images
Responsive Images For Designers: The HTML5 picture element
Responsive Images Done Right: A Guide To
Thanks for sharing this list, @bengie and @bytte