John Palfrey has a great discussion on how to properly aggregate RSS feeds and offer that aggregated view without stomping on your source and violating his copyrights. John runs an aggregation service called Top10Sources.
http://blogs.law.harvard.edu/palfrey/2006/01/17
Here's the important points he makes.
- Top10Sources attempts to contact sources before republishing.
- Top10Sources removes content at the authors requests.
I would also add that Top10Sources doesn't not actually make a permanent copy of the RSS data. Rather, it simply lists the most recent items in the source RSS feed. He truly is aggregating feeds, not copying the content within.
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