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NewsGator and AideRSS have partnered to add PostRank features to NewsGator's online RSS feed reader. PostRank is basically determined by looking at each item in a feed and determining its popularity based on factors such as how many comments it has received, how many other sites link to that post, how many times it has been saved to del.icio.us, or voted up on Digg. Each article is then assigned a rank between 1 and 10.

NewsGator users can now choose to sort their feeds according to PostRank, which will display the most popular items first, followed by less popular items. Of course, the system doesn't work very well if you're primarily interested in breaking news, as it takes time for an article to become popular. But if you just want to read the top news and skip the rest, PostRank can save you a lot of time.

AideRSS maintains its own website where you can enter any RSS feed to get its PostRank scores. Or you can install a Firefox plugin that will add PostRank to Google Reader. But thanks to the NewsGator integration, you won't need to visit a separate web site, download a plugin, or even know who AideRSS is to take advantage of their PostRank system.