Hacker News is a great resource. However, I seemed to constantly run into two issues. 1. If I didn't visit at least once a day, top items would scroll off the top pages and I would never see them. 2. If I was procrastinating and visiting the page often, I would find it difficult to determine what was new on the page. That frustration led to hckr news, a chronologic list of items that have made it onto the Hacker News homepage.
Filter the list down:

See what's new:

Retrieve previous days

The browser extension adds a few features to both Hacker News and hckr news
Since the page was last visited.

in threads you've already visited.

Chrome: hckr_news.crx
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Safari: hckr_news.safariextz
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Firefox coming soon?
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If you have any questions or requests, please mail me at wayne@larsen.st.