I keep getting requests for a list of keyword based rss feeds.  Here’s the list I have floating around.  Warning:  I don’t use all of these anymore so I don’t know if there are any duds…. or even where I compiled the list any longer.  You can use these with rss rebound of course.
Feel free to add more in the coments.

http://www.goarticles.com/cgi-bin/rss-search.cgi?term={keyword}&&l=20&s=1&c=none&D1=subject

http://a9.com/{keyword}?sel=0

http://api.search.yahoo.com/ImageSearchService/rss/imageSearch.xml?appid=yahoosearchimagerss&query={keyword}&adult_ok=1

http://api.search.yahoo.com/NewsSearchService/rss/blogSearch.xml?appid=YahooRSSSearch&query={keyword}&sort=date

http://api.search.yahoo.com/VideoSearchService/rss/videoSearch.xml?appid=ysearchblog&adult_ok=0&results=50&query={keyword}

http://api.search.yahoo.com/WebSearchService/rss/webSearch.xml?appid=yahoosearchwebrss&query={keyword}

http://bigfeeder.com/rss/tag/{keyword}?subdomain=

http://blogsearch.google.com/blogsearch_feeds?hl=en&q={keyword}&ie=utf-8&num=10&output=rss

http://del.icio.us/rss/tag/{keyword}

http://feeds.technorati.com/feed/posts/tag/{keyword}

http://ma.gnolia.com/rss/full/tags/{keyword}

http://news.google.com/news?hl=en&ned=us&q={keyword}&ie=UTF-8&output=rss

http://news.search.yahoo.com/news/rss?p={keyword}&sm=Yahoo%21+Search&toggle=1&cop=&ei=UTF-8&eo=UTF-8

http://rss.api.ebay.com/ws/rssapi?FeedName=SearchResults&siteId=0&language=en-US&output=RSS20&fsop=1&sacat=-1&fsoo=1&satitle={keyword}

http://rss.findory.com/rss/Blogs?q={keyword}

http://rss.findory.com/rss/News?q={keyword}

http://rss.topix.net/search/?q={keyword}&list=1&xml=1

http://rss.waypath.com/query.xml?mode=best&qs={keyword}

http://scuttle.org/rss.php/all/{keyword}

http://search.infocious.com/q?fmt=xml&s={keyword}

http://search.msn.com/news/results.aspx?q={keyword}&format=rss&FORM=RSNR

http://search.msn.com/results.aspx?format=rss&FORM=RSRE&q={keyword}

http://shopping.msn.com/xml/xmlresults/shp/?text={keyword},format=rss

http://video.google.com/videofeed?type=search&num=20&output=rss&q={keyword}

http://video.google.com/videofeed?type=search&num=20&output=rss&q={keyword}

http://www.blogdigger.com/media/rss.jsp?q={keyword}&media=video&media=audio&sortby=date

http://www.blogpulse.com/rss?sort=date&operator=and&query={keyword}

http://www.connotea.org/rss/tag/{keyword}

http://www.feedsfarm.com/s/{keyword}&format=rss

http://www.feedster.com/search/category/blog/{keyword}

http://www.feedster.com/search/type/rss/{keyword}

http://www.feedster.com/search/type/rss/category/news/{keyword}

http://www.feedster.com/search/type/rss/category/podcast/{keyword}

http://www.findarticles.com/p/search?qf=all&tb=art&x=21&y=12&pi=rss&qt={keyword}

http://www.flickr.com/services/feeds/photos_public.gne?format=rss_200&tags={keyword}

http://www.goarticles.com/cgi-bin/rss-search.cgi?search_content={keyword}&l=20&s=1&c=none&D1=advanced

http://www.icerocket.com/search?tab=blog&q={keyword}&rss=1

http://www.icerocket.com/search?tab=news&q={keyword}&rss=1

http://www.icerocket.com/search?tab=web&rss=1&q={keyword}

http://www.rocketnews.com/news/RocketinfoXML.jsp?must={keyword}&age=0

http://www.rocketnews.com/news/RocketinfoXML.jsp?must={keyword}&age=4

http://www.shadows.com/rss/tags/{keyword}

http://www.sphere.com/rss?q={keyword}&datedrop=1&lang=en&x=0&y=0

http://www.wired.com/support/search.html?query={keyword}&src=wirednews&num=10&first=0&format=rss

http://www.vaporum.com/cgi%2Dbin/rss%5Fsearch/flo.pl?query={keyword}

You can also plug in a keyword into rss mountain and get some targeted feeds.  (you should also be submitting here).

http://www.rssmountain.com/rss_directory.php