That is important to me too. Agregating feeds from google news on different keywords but on the same topic can create duplicate.

Using the original URL article as a key would be a great start.
But did you mean looking into the content itself and use calais to determinate duplicates? Is that possible?

Oh and by the way, this "bookmarklet" could be used to add a feed... For exemple, instead of selecting google reader to add a feed, it would ad it to tattler, and use it as a social feed reader..

Yes like in delicious, or Diigo. Agregating contents from feeds is great to suggest contents to a community, but each member surfs the web and sometimes finds contents that are worth sharing. the Prepopulate module is supposed to do that (http://drupal.org/project/prepopulate) but is a bit tricky (doesn't work for me with all types of contents).

The process would be: I see a info on the web - I highlight what I want to be posted - I press "bookmark this".
If the content URL is not already in tattler, then it creates a mention (or blog entry) with a source, the highlighted text and a comment.
If the URL is already in tattler, then it adds a vote to the mention, and create a comment with the highlighted text (quote) and my comment. It should as well automatically flag the content under "bookmark" .

That would rock and give another 2.0 dimension to tattler

That is how it was 3 months ago as well... But I didn't check eversince..

Sounds like what the "pop up" module on Drupal is doing.. ...

Do you mean that this can me automated ?

Let's take the exemple of a political website. What sounds positive to republican can sound negative to democrats. so positive or negative could take into account the "conviction" of the member.

Without going that far, using the flag module could help....