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I've come across different sales pages on the net trying to sell you rss feed software.
They claim that if used wisely ie having real content on your site supplimented by rss feeds then you stand a better chance of regular visits from spiders epecially googlebot since you are getting fresh content and ultimately increasing visitor traffic to your site.
Have you had any positive results from intergrating RSS feeds to your site by getting additional traffic?
As far as having other peoples feeds on your site to boost rankings/freshness, I would say your best bet is to write your own new unique content on a regular basis.
Anyway, I didn't mean to dump on the person who started the thread, but I do believe that when it comes to RSS, webmasters should also think about creating their own feeds, rather than just using other's feeds for kw benefits.