Ranking Feed Relevance Via PostRank RSS Filtering

Interesting example, I like the way he normalizes the results, this is particularly relevant for separating the background buzz from exceptional articles.
PostRank RSS Filtering

After a few days of ‘I wonder if a PostRank scheme would really work?’ , I rolled up my sleeves and put together a quick ruby application to test my theory. Here is how it works: you specify the feed URL, I parse the results, scour the Internet for information on every post in your feed, rank each post with respect to the combined score, and return the ranked results. Here is a sample run on my own feed[...]