This is a generic filter to merge feeds, remove duplicates and ensure unique items in feeds. You can also truncate or limit the maximum number of resulting items per feed. Replace default feeds and max items below with your own feeds.

Take any two XML feeds and merge them together, taking the latest 25 unique items from the combined set.

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Find Unique Subscriptions between two FriendFeed Users

RSS Combined Unique Feed of EZTV and VTV releases. using bt-chat.com "Get as RSS" for proper links.

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Merge five feeds. Corrects for Chinese pubDate; sorts according to pubDate; filters non-unique entries based on titles; add date & source site in each entry's title; correct for author (some sites use dc:creator as the author)

Daily digest of top technology news, aggregated, filtered for duplicates then ranked with PostRank from AnandTech, Ars Technica, CNET, Digg, Hard OCP, Kuro5hin, Mashable, Neowin, Newsforge, O'Reilly Network, Original Signal, Slashdot, Techdirt, Techmeme (http://www.techmeme.com/lb), Tom's…

World news from multiple sources, filtered to get only unique results.