Given the huge overlap between bloggers and Twitter users, I suspect this simple new site might take off. Or, at least I’m sure we’ll be seeing its end product on a lot of blog sidebars.
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The site also has some other basic features, like seeing who the most popular Twitter users are (as measured by number of followers) and who the most recent users are that they've started tracking. For any username you enter in, you also get a bar graph showing the growth of that user’s following over the past 7 days. However, it looks like it only started counting in the last couple days, so give it a week or so to start showing accurate graphs.