I highly recommend that you read Mindy McAdams’ post about aggregation and curation.
The post cites (and praises — thanks, Mindy!) my blog post last year on aggregation guidelines.
I said aggregators should link (Mindy did), attribute (ditto) and add value (certainly, especially with three strong examples). Excellent aggregation by Mindy. One indication that this aggregation is good journalism and not theft: I feel honored, not ripped off.
— Mindy McAdams (@macloo) September 7, 2013