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Yahoo pipes, it’s amazing, a web service I like. I started playing with this because I couldn’t find a decent selfhosted script which would allow me to merge several rss feeds into one new feed. Within a couple of minutes of figuring it out I had exactly what I wanted; a new feed which grabs several rss feeds and outputs a feed with the newest 10 items.

Basically you just have to think of what you want to accomplish and you can drag and drop the elements into the editor area and connect them with pipes to direct the flow of data.
So in my example (click on the piccy for the full version), I use Fetch Feed to grab a feed,
pipe it to Regex to change the title, I insert the author name in front of the title.
Then I combine all of them in Union. Of course if you have more then 5 feeds you can use multiple Unions.
Onwards to Sort to make sure all items are sorted based on the publication date, in descending order.
Truncate because I only want the 10 most recent items.
And finally to Pipe Output to wrap it up.

Save it and there you go, your new rss feed which you can use wherever you want.
Sweet.