aideRSS - Now things are getting smarter
This is clever. AideRSS is an smart RSS filterer gives just the Good, Great, Best or Top 20 posts given any RSS Feed. How does it measure quality? Well, since it can't really measure quality it infers it indirectly by creating a metric based on the number of del.icio.us bookmarks, diggs, Blogger references, Technorati references, Google BlogSearch reference, IceRocket references and a few others.
Of course, this assumes your blog is being read because it's interesting and these external references are a quantitative metric that implies quality. There, of course, are lots of great blogs with great content that haven't been discovered yet, but this is still a pretty neat way to apply these metrics.
So what do they do with these numbers? They create alternative feeds that you can subscribe to in lieu of the blog's main feed so as to just read about the "great posts" or "just the hits." Sounds like a great idea, but then you'd miss all the posts about my kids!
Here is one of their active widgets showing me the percentage of my posts that don't suck (so say their metrics. ;) )