The ability to favorite an item was added to Hacker News nearly a year ago. The feature has had a good amount of adoption, and you can browse to the profile of any user and see a list of the items they want to remember. I thought it would be interesting to see the HN community's favorites as a whole, so I created this site.
Currently the HN API doesn't make this information available, so the data for this site has been (respectfully - 1 req / 30 sec) scraped. Because of this, the database of favorited items is still under construction and not real-time.