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 want to use Yahoo pipes then you are going to have to spend a bit of time with the tool to get to know how it works. It will not suit someone who wants to mash a few feeds together quickly.
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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