Yesterday was a celebrity listing, so today is ExecTweets. A collection and catalog of business executives that use Twitter. There is a voting ability and they have some sorting for featured and top tweeters. Here is excerpt from their About page.
ExecTweets is a resource to help you find and follow the top business executives on Twitter. Created by Federated Media, in partnership with Microsoft, ExecTweets is a platform that aggregates the tweets of top business execs and empowers the community to surface the most insightful, business-related tweets.