Favstar gets even better if you sign in.
Sign In with Twitter
signing in is good for you.
That smartypants @armstrong released http://t.co/G0s3pEy5, a simple but elegant little tool for testing and previewing responsive designs.
This is where Ethan Marcotte (@beep) curates link-y things about responsive design. He also wrote a book on the topic: http://beep.fm/x/e7