The Nike Post Season Twitter Playoff [nikebasketball.com] reveals the relative popularity of NBA teams within the Twitosphere in real-time. The interface is the newest creation of Stamen Design, who have created several other real-time Twitter visualizations for several fancy clients, including MTV (Video Music Awards), the NBC (Winter Olympics) and Twitter themselves.
In the Matchup interface, the rectangles captured in the treemap-like interface represent a different NBA team each, and dynamically scale according to the number of tweets per minute for that particular team. The Bracket interface orders all the teams in a visual ranking that mimics a play-off style competition. The teams with the most tweets can win "matchups" while miving to subsequent rounds.