I came across Twistori tonight. The site is a "first person" visualization of Twitter messages, inspired by We Feel Fine. Twitter messages are filtered by occurrences of the phrases "I love", "I hate", "I think", "I believe", "I feel" & "I wish", which are placed in a visual scrolling message ticker, similar to Digg Labs BigSpy.
The site is a great aggregator for human emotions on Twitter.
Also check out http://wwdc.twistori.com for WWDC tweet coverage.