I was wondering the same thing. I expected this to be about click tracking, but it is just using the hacker news api to count the points or comment counts to produce the overlay.

drag the 'HN heatmap' link to your bookmarks bar, go to HN frontpage, click the bookmarklet, enjoy. It's basically just the visualization for now.

Love the site design, has some serious impact. Any tools/software used when doing that design or was it just notepad?

By the way, your heatmap download contains a .png that takes up 99% of the size. I'd suggest taking it out.

I appreciate you're liking it, the only tool I used for it was vim. Thanks for the hint, makes sense to remove that from the archive