Removal of duplicate headlines.

[kcmjr]

This may be a redundant question, I wasn't able to find it referred n the forums so please hold the flames if it's covered elsewhere. If not please consider it a suggestion.

I have a number of feeds that duplicate entries. For example go see the feeds at CNET or The Register. I'd like to be able to filter out any entries that already exist elsewhere. This would cut down the amount of articles I need to sift through.

Does this feature already exist or can it even be added?

Thanks