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Excellent article.
"A newsradar is a constantly updated thematic channel of highly relevant web references that are gathered in accordance with specific, persistent search criteria. Newsradars can focus on anything: topics, people, opinions, products, news items, events or passions. The constant updating of the channel is accomplished by leveraging the persistent-search, aggregation and filtering capabilities built-into RSS technology couple by the ongoing skilled and attentive work of a human newsmaster curator."
You can't get a better article about curation today i think. This covers it all. A complete guide.