If you've recently started following a lot of people in Google Reader, you might have noticed a lot of duplicate items being shared.I have experimented with a Greasemonkey user script that purports to remove duplicates. Some users have reported problems with the script's earlier versions, so I suggest you use caution if you decide to use it. You should backup your Reader subscriptions as an OPML file via Import/Export under Settings. I have found that it is filtering my duplicates excellently so far. Install the Google Reader Filter script (you'll need Greasemonkey script support in your browser) and let me know if it works for you as well. The script does more than filter duplicates. You can filter out unwanted content or highlight wanted content based on keywords. Pretty useful!
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