An aggregation network takes data through RSS/Atom feeds and uses it to build a website which acts as a concentrator of articles. Ideally an aggregation network focuses on a given topic, bringing together pointers to articles and the like on that given topic. However the ideal isn't always followed, and there are many sites which grab as much content as they can, using RSS/Atom to automatically build large sites based on other peoples writing, and wrap advertising around the result.
What's covered in these pages are the ethical and appropriate way to build a blog or podcast aggregation network.