Klout (beta) is a Chrome Extension that was born in a recent Hackathon between bit.ly and Klout. It’s a Twitter rating system that once installed tells you what Klout scores Twitters users have in your Twitter stream. The higher their Klout score the greater their power influence in the Twitterverse.
It ranks search results and lists, which is great because it allows you to weigh how much importance you give to certain Tweeps.
Klout is a service that allows users to track the impact of their opinions, links and recommendations across their social graph. It uses over 35 variables on Facebook and Twitter to measure True Reach, Amplification Probability, and Network Score.
It is not known if there are plans to bring this to other browsers. However if you are a Chrome user you can get the extension here for free.