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FeedMingle is a Feed mixing + generation tool. If you want to combine more than two RSS/Atom sources, give them to FeedMingle for processing. It can help you mix your feeds, generate a new RSS/Atom/JSON, and generate the repost code.
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Use of FeedMingle is very simple, just paste in the Feed feeds you want to mix, one in a row, give them a title, and it's OK
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Take a look at the resulting results:
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Technorati tags: rss,feed,atom,json