RSS Blogs Publishing Other Peoples Blog Posts

I have recently noticed that pingbacks I am receiving on many of my posts are from blogs that are simply ripping off RSS from various other blogs that they can get their grubby paws on to. Can anyone explain this to me??Here is a list of a couple that I have noticed:http://www.rss.markpromotion.com/camel-gets-some-flavour.htmlhttp://thedrunkkansan.com/music/?p=6083http://thedrunkkansan.com/hottness/2007/04/09/stop-twittering-you-twit-live-your-life/http://www.rss.wineflavour.com/sa-cookbook-wins-food-and-wine-oscar.htmlhttp://www.rss.romanianfootball.com/football-hooliganism-makes-football-watchable.htmlhttp://world-beaches.biz/best-beaches-in-sa/UPDATE:Thanks to grandMasterkrust, I have found and installed a few plugins that will hopefully be solutions to an apparently large problem. Go figure. Check out these links if you are experiencing the same problem as I have been:http://www.plagiarismtoday.comhttp://redalt.comhttp://www.numly.com