Twitter Vision (like a humankind lava lamp) 

Twitterverse presents a "cloud" visualization of term clustering from what people are posting. As Google went public with its DoubleClick acquisition, the Twitterverse "shouted up" the size of "Billion" and "Google." Common emphasized terms with early adopters include "blog," "coffee," "day/morning/night," "going," "new," "sleep" and "twitter."

Twitterholic: Tracks the top performing Twitterers. The example below tracks the progress of Robert Scoble, one of the twitchiest, most erudite and smartest posters (he is the first "friend" I recommend you enlist).

Twitterment: Search on specific terms being discussed or compare different terms/categories. In this example, I compare beer volume over wine:

For the latest web, desktop and device-based applications, check out the Public Wiki on Twitter.