How is Twitter useful?

Getting the most out of Twitter – N.Y. Times By CLAIRE CAIN MILLER March 3, 2010 – “The truth is, you don’t have to post a message to get the most out of Twitter.”	 
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 	 http://ulvlibrary.wordpress.com/2010/01/20/how-are-you-using-twitter-in-classes/ 	 http://arstechnica.com/business/news/2010/02/collaboration-20-twitter-team-ups-for-fun-and-profit.ars 
 
 Please add your own experiences or other examples.