Several RSS feeds into one?

Is there a tool that can be used to make one RSS feeds from several feeds I select?

If I have it I can use Feedroll to display “15 latest posts from KnowledgeBoard bloggers” or “10 latest posts by my colleagues”…

It’s should be so easy to make one, but I wasn’t able to find any :(

Archived version of this entry is available at http://blog.mathemagenic.com/2004/02/11.html#a1078; comments are here.

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Tagged as: blog tools, RSS