The Hourly Hacker News Snapshot is now much easier to browse! I’ve added date and time controls which let you access the snapshot for the desired date and hour with great ease.
The snapshot collection can still be browsed manually, with hackable URLs, if you prefer. For instance, the URL for the snapshot corresponding to July 5, 2011 at 9:00 a.m. is http://hhn.domador.net/2011/07/05/09 (times are in PST or PDT).
An older article explains the original rationale for this service.