Hello HN. I've made yet another HN app that helps people to to browse best HN articles of previous hours, days, weeks etc. Additionally it has a "slide" feature (a.k.a time machine) that shows snapshots of front page articles back in time.
http://hndiary.com
try the "best of" menu and tell me your opinion. Your feedback is valuable.
PS. it shows only links, it does not crawl comments.
PPS. I submit this from the airport, when I land I will answer your questions if any. some basic info is here http://hndiary.com/static/about :)