HN has a good combination of content selection and comments. I've honestly never seen such high quality commenting on articles. I generally find about half of

HN has a good combination of content selection and comments. I've honestly never seen such high quality commenting on articles. I generally find about half of the links on the front-page interesting, and the comments are always lucid. If the link is garbage, somebody always points out the errors in the link in an intelligent way, not an annoying way (like /.).