Another idea is to use the AideRSS extension for Firefox to restrict the reading list to the most popular items. AideRSS uses some arbitrary data that could measure the popularity of a post: the number of comments, Google Blog Search backlinks, del.icio.us bookmarks or the number of votes at Digg and reddit. All these values are used to calculate PostRank, a number from 1 to 10 that tells the popularity of a post among all the posts from the same feed.
Once you install the extension (or just the Greasemonkey script), AideRSS adds the PostRank value next to the title of each post and lets you filter the most popular posts. If you select a folder or switch to the "all items" view, AideRSS adjusts the ranking values based on the context.
While AideRSS has an interesting approach to deal with information overload, PostRank is not a great measure to determine if a post is popular, since it relies on a small number of arbitrary signals. It's also useless for recent posts and it's biased against popular sites. The extension may slow down your browser if you have many subscriptions.
AideRSS also integrates with NewsGator and it lets you subscribe to the most popular posts from a feed: best posts from Google Operating System or from an OPML file.
{ via AideRSS Blog }