There's also the reader extension http://labs.postrank.com/gr http://labs.postrank.com/gr You can set the treshold, and it will dim out the items that are below

There's also the reader extension http://labs.postrank.com/gr http://labs.postrank.com/gr You can set the treshold, and it will dim out the items that are below it. It greatly increases your ability to "fly through" items, without worrying too much about what you're missing.