Something like a highlights of the day feed. Based on some combination of how many likes, comments, zaps, and web of trust score. It should be user configureable so the user can toggle those criteria and any other criteria. You could also adjust the timeframe so you could have highlights of the day, week, month, all-time hall of fame.

Primal is doing some aspect of this with the trending and most zapped column which is very cool.

The following+ tab on nostrgram is pretty cool but doesn't really help with the time issue.