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Search for webmasterworld [search.yahoo.com]
It seems they have also built a web based RSS aggregator into the My Yahoo! product w/ links from the SERPS to add a feed to your aggregator. Call me a geek, but this is pretty cool stuff.
Searching advanced..
File Format Only find results that are: RSS/XML (.xml)
and then search for the [search.yahoo.com] brings up an interesting list of the big names.
I'm wondering if RSS/XML (.xml) suggests also .rss? .rdf?