The web 2.0 RSS mashup from Yahoo allows you to mash several feeds into a single feed. You are also able to filter and sort the resulting combined feed to generate the desired results.
Web 2 complicated
The interface is very web 2.0. You drag components onto a design area to import mix and create feeds. While there is no doubting this is probably the most advanced RSS web tool available at the moment this is probably also it's downside.
If you are looking to do some more advanced things with feeds then this is the tool for you as long as you are willing to put in the time initially for the sharp learning curve.
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