With over 2000 different services based off of Twitter in existence (and growing every day), it's hard to say if there are any "definitive" rankings of Twitter users. That said,
Tracking Twitter seems to take a pretty good stab at ranking brands, celebs, media, etc on Twitter.

Created by NYC digital strategy firm
Electric Artists, it's not entirely clear what Tracking Twitter's rankings are based on. It would seem to purely be number of followers, but with some side comments on a few brands it suggests that maybe human's opinion may be a factor too. In any case, is worth a look at some of the best Twits (Tweeple, whatever you want to call people on Twitter) out there to see what they're doing right.
Of special note,
Flying Dog Brewery (
@flyingdog), formerly based in Colorado, appears at the number 23 spot, the highest rated alcohol brand on the chart. Hard to believe that a craft brewer (ranked in the mid 20s as far as biggest brewer in the nation) could be out Tweeting the big players. That is, unless you've been a follower of
@flyingdog. If you are then you understand how they keep their tweets funny, interesting and informative-the perfect mix for attracting more followers.
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