Well not exactly real time sentiment analysis, but Tweetfeel does quickly grab a batch of the most recent keyword specific Tweets and present them in a way that gives its users a general sense about what the prevailing sentiment is about a subject.
Real Time Sentiment Analysis
Whether the Twitter data set is large enough to draw accurate conclusions remains questionable though.
For instance, a search for Twitter in Tweetfeel produces a near equally divided set of responses both “for” and “against” Twitter.
Curious results since all of the “sentiment” gathered about Twitter is from Twitter itself.
Search Marketing Communications 
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