I spotted the following a while ago. It's a greasemonkey script that is supposed to modify new comments on HN in some distinct way like highlighting them or similar. I haven't tried it or read the code.<p><a href="https://github.com/polyfractal/HNHalfLife" rel="nofollow">https://github.com/polyfractal/HNHalfLife</a>
I wrote a greasemonkey script <a href="https://gist.github.com/1187770" rel="nofollow">https://gist.github.com/1187770</a><p>What this does is allow you to navigate through the comments chronologically, using the right and left arrow keys.<p>That is, when you visit an HN thread, you just press the right arrow and it takes you to the latest comment. Press it again and it takes you to the 2nd most recent comment, etc. Pressing the left arrow moves you backwards.
My buddy Michael Schade put this tool together, if you're interested: <a href="https://github.com/michaelschade/hnpc" rel="nofollow">https://github.com/michaelschade/hnpc</a>