I've been using Yahoo Pipes for at least 3 years now at work to filter book reviews feeds from diverse sources.
It's quite easy to tailor to your needs and you can take out doubles, sort the results your way, then you subscribe to the feed of your pipe through your favourite feed reader.
Mine is Netvibes which has a public and private option so I can also share the results of the yahoo pipe through my public Netvibes for other librarians to use.
I used these to figure out how to tailor the data :
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It's quite easy to tailor to your needs and you can take out doubles, sort the results your way, then you subscribe to the feed of your pipe through your favourite feed reader.
Mine is Netvibes which has a public and private option so I can also share the results of the yahoo pipe through my public Netvibes for other librarians to use.
I used these to figure out how to tailor the data :
http://www.mrspeaker.net/2007/02/10/yahoo-pipes/?year=2007&monthnum=02&day=10&page
Some other tutorials : http://pipes.yahoo.com/pipes/docs?doc=tutorials
My Yahoo pipes for book reviews updated last in 2008 but created in April 2007 : http://pipes.yahoo.com/pipes/pipe.info?_id=1sBLERri2xG3oWfCjknRlg
Hope it helps