Ask HN: What websites are leading the way in terms of web development?

As it says in the title. Beautiful and clever development is a very subjective issue but I'm interested in the collective HN opinion on what sites define the standard for what all web developers should be striving for.

Sites such as http://www.milwaukeepolicenews.com/ to me at least, look streets ahead of 'mainstream' websites so I'm curious to know what other examples I should be aware of.