I really liked StumbleUpon exactly for this feature until they ruined the product during the monetization phase. Edit: Having comments is really important. May

I really liked StumbleUpon exactly for this feature until they ruined the product during the monetization phase. Edit: Having comments is really important. Maybe marked by color of source (blue for reddit and orange for hacker news) and separated into submission sections. Also important is the preservation of the original tree structure of the submission comments.