I've recently released a new version of HN Comment Embed, a greasemonkey script that embeds HN discussions into the webpage being discussed.
You simply browse to a posted page, and the HN panel pops up on the side.
This version relies on searchYC as its main source, but also parses HN's newest posts page to attain full coverage.
http://share.shmichael.com/hn_comment_embed.user.js