Aggregation

I'll get into why and how.

Some spectrums:
 * 1) number of items aggregated
 * 2) degree of information compression (compressing info into a single word is the ultimate compression; a phrase, sentence, title, or headline is high compression, a summary is a bit less compression)
 * 3) which levels of information compression are available (does it just have a full text and a title, or does it also have a table of contents with sections and sub sections, with summaries for each section?)